A Comprehensive Evaluation of the Constitution of Japan: Efficacy, Challenges, and Proposals for the Future

Part I: The Structure of the Constitution and Its Historical Foundation

Section 1: The Origins and Basic Principles of the Postwar Constitution

1.1 The Postwar Directive: From the Meiji Constitution to the GHQ Draft The current Constitution of Japan represents a fundamental shift from the system under the Constitution of the Empire of Japan (Meiji Constitution), which vested sovereignty in the Emperor.¹ Following Japan's defeat in World War II, and at the suggestion of the General Headquarters of the Allied Powers (GHQ), the Japanese government began considering constitutional revision.⁴ Initially, the draft compiled by the Constitution Investigation Committee, led by Minister of State Jōji Matsumoto (the "Matsumoto Draft"), was a conservative document that preserved the framework of the Meiji Constitution, such as by maintaining the Emperor's comprehensive sovereign powers.⁵

However, on February 13, 1946, GHQ rejected the Matsumoto Draft and presented the Japanese government with its own constitutional draft (the "MacArthur Draft").³ This draft was prepared in an extremely short period of about ten days by the staff of GHQ's Government Section, led by Colonel Charles Kades, without the involvement of the Japanese side.⁸ The presentation of this GHQ draft became a decisive turning point in Japan's constitution-making process.

The subsequent process was a series of complex negotiations to translate and adapt the English-language draft into Japanese articles that would fit Japan's legal system. For example, Japanese officials, including Tatsuo Satō, Director-General of the Cabinet Legislation Bureau's First Department, engaged in painstaking bargaining with GHQ over every single phrase. One notable attempt was to replace the GHQ draft's phrase "advice and consent" regarding the Emperor's acts in matters of state with the word hohitsu (輔弼), which carried a nuance more respectful of the Emperor's authority.¹⁰ Ultimately, a draft based on the GHQ proposal was deliberated in the Imperial Diet, and after some amendments (for instance, adopting a bicameral system instead of the unicameral system in the GHQ draft), it was promulgated on November 3, 1946, and came into effect on May 3, 1947.³

1.2 The Three Pillars: Popular Sovereignty, Respect for Fundamental Human Rights, and Pacifism The Constitution of Japan is founded on three basic principles, which are generally considered to be all but impossible to amend.²

• Popular Sovereignty: This signifies a shift from the Emperor sovereignty of the Meiji Constitution to the principle that the source of the state's sovereign power lies with the people. The Preamble declares that "sovereign power resides with the people," and the Emperor is positioned as a symbol "deriv[ing] his position from the will of the people."¹

• Respect for Fundamental Human Rights: It guarantees human rights not as "rights of subjects" granted by the state, but as "eternal and inviolate rights" that humans possess by birth.² This is based on the idea of natural rights, where human rights are a universal value that precedes the constitution and laws. This is a crucial difference from the Meiji Constitution, which allowed rights to be restricted by law.²

• Pacifism (Article 9): Stemming from deep reflection on the devastation of World War II, this principle stipulates the renunciation of war, the non-maintenance of war potential, and the denial of the state's right of belligerency.² This comprehensive and thorough pacifism is a feature unparalleled anywhere in the world.

1.3 The "Imposed Constitution" Debate and Its Legacy Due to the GHQ-led process of its enactment, the Constitution of Japan has long been subject to the "imposed constitution" controversy regarding its legitimacy.⁶ This view questions the lack of autonomy in the drafting process. On the other hand, strong counterarguments emphasize that the thinking of progressive Japanese scholars was reflected in GHQ's drafting,²⁰ that the Japanese side made revisions during deliberations in the Imperial Diet,⁹ and, above all, that the Japanese people accepted this constitution after the war and have embedded its ideals in their society. As Jirō Shirasu noted, the perspective that "a good thing is a good thing," regardless of its origins, is also important.⁹

A remarkable feature can be observed in the constitution's enactment process and content. Despite its origins—being drafted under foreign leadership in an extremely short period during the extraordinary circumstances of an occupation, a background that could normally undermine its long-term legitimacy—it has never been amended in over 75 years of enforcement, making it the world's oldest unamended constitution.²¹ This fact is not a mere coincidence but likely the result of several intertwined factors. First, for a populace exhausted by war, the constitution's ideals of pacifism and fundamental human rights gained strong support. Second, the economic prosperity achieved under the constitution reinforced the stability of the new political system. And third, the high hurdle for amendment set by Article 96—requiring a two-thirds majority in both houses of the Diet and a majority in a national referendum—has created a strong bias toward maintaining the status quo. In other words, the constitution's legitimacy has been secured less by the formalities of its enactment procedure and more by the substance of its content being accepted by the people, the subsequent historical context, and its institutional stability.

Furthermore, the Constitution of Japan is not merely a collection of legal norms; it also possesses the character of a cultural document that speaks to the nation's ideals. Expressions in the Preamble and Article 9, such as "trusting in the justice and faith of the peace-loving peoples of the world" and "sincerely aspiring to an international peace," transcend legal obligations and take on the character of a philosophical and moral pledge for the nation.¹ Consequently, debates surrounding the constitution, particularly Article 9, are not just about legal interpretation or policy but take on a highly political and cultural significance, questioning Japan's national identity and historical consciousness itself. This dual nature of the constitution complicates the amendment debate, makes consensus-building difficult, and, as a result, contributes in some ways to its "immutability."

Part II: The Operational Reality of the Constitution: A Multi-faceted Evaluation of the Government Structure

Section 2: The Evolution of the State Apparatus

2.1 The Cabinet and Central Ministries The Constitution of Japan established a parliamentary cabinet system in which executive power rests on the confidence of the Diet.³ Japan's cabinet system dates back to 1885,²² but its character was significantly transformed under the postwar constitution. Postwar, Japan's administrative machinery has undergone numerous reforms. Particularly significant was the central government reform promoted under the Ryutaro Hashimoto cabinet and implemented in 2001. This reform aimed to rectify the弊害 (ills) of sectionalism and strengthen the cabinet's leadership and comprehensive coordination functions by reorganizing the existing 1 office and 22 ministries into 1 cabinet office and 12 ministries.²⁸ In addition, reforms aimed at streamlining and increasing the efficiency of administration have been carried out intermittently in response to the demands of the times, such as the fiscal reconstruction and deregulation agenda of the Second Provisional Commission for Administrative Reform (Rinchō) under the Zenkō Suzuki and Yasuhiro Nakasone cabinets, and the structural reforms of the Junichirō Koizumi cabinet.³¹

2.2 The Diet and Political Parties The Constitution defines the Diet as "the highest organ of state power" and "the sole law-making organ of the State."³ Postwar party politics was long characterized by the "1955 System," a two-party system established in 1955 with the Liberal Democratic Party (LDP) and the Japan Socialist Party.³⁵ Under this system, the LDP held power almost continuously until 1993, providing political stability but also creating problems such as political rigidity and collusive structures due to its long tenure. The LDP's fall from power in 1993 symbolized the collapse of the 1955 System, ushering in an era of political realignment where coalition governments became the norm. During this process, electoral system reforms, such as the introduction of a parallel voting system combining single-member districts and proportional representation, were also implemented, leading to repeated realignments and breakups of political parties.³⁵ Many of Japan's major political parties can trace their origins to organizations formed before or immediately after the war.³⁶

2.3 Local Autonomy Chapter VIII of the Constitution guarantees local autonomy. Whereas the prewar local system was highly centralized,⁴⁰ the postwar system institutionally guarantees decentralization, for instance, by introducing the direct popular election of governors and mayors, and assembly members.⁴¹ The history of postwar local autonomy is characterized by municipal mergers (the great Shōwa merger and the great Heisei merger) aimed at administrative efficiency⁴⁰ and by decentralization reforms to transfer authority from the national to local governments. The enactment of the Comprehensive Decentralization Act of 1999 was a particularly groundbreaking event, as it abolished the system of "agency-delegated functions" and helped transform the relationship between the national and local governments into one of equals.⁴⁰

Section 3: Society, the Economy, and the Constitution

3.1 Corporate Society The rights to own property (Article 29) and freedom of economic activity (Article 22) guaranteed by the Constitution became the legal foundation for Japan's postwar economic recovery and high-speed growth. Postwar Japanese companies developed under a stable governance structure characterized by cross-shareholding and the main bank system.⁴³ However, against the backdrop of economic stagnation since the 1990s and a series of corporate scandals, corporate governance reform became an urgent task. Consequently, the introduction of the Stewardship Code (principles for institutional investors) in 2014 and the Corporate Governance Code in 2015 promoted the appointment of outside directors and demanded an emphasis on shareholder value and improved management transparency.⁴⁴

3.2 The Third Sector (Civil Society) Freedom of association, guaranteed by Article 21 of the Constitution, is the cornerstone of civil society activities. The turning point for the development of civic activities in Japan, particularly non-profit organizations (NPOs), was the Great Hanshin-Awaji Earthquake in 1995.⁴⁸ In this disaster, many volunteer groups played a crucial role, but at the same time, the operational constraints they faced as unincorporated voluntary associations (e.g., inability to be a contracting party, difficulty receiving public support) were brought to light. This experience fueled momentum for legal frameworks to promote civic activities, leading to the enactment of the Act on Promotion of Specified Non-profit Activities (the NPO Act) in 1998. This opened a path for civic groups to obtain corporate status through simple procedures and contributed significantly to the development of Japan's NPO sector.⁴⁸

3.3 The Fourth Estate (Media) Freedom of expression (Article 21) guarantees the media's function as a watchdog over the government in a democratic society. Japan's media began with the birth of newspapers in the Meiji era⁵³ and gained significant influence with the postwar proliferation of mass media like radio and television.⁵⁴ The media, which had served as a propaganda tool for the state during the war, came to be expected to play the role of the "fourth estate," monitoring the government. In recent years, with the spread of the internet, an era has arrived where anyone can be an information provider. The influence of traditional newspapers and television has relatively declined, and the media environment has become more diverse and multi-layered.⁵⁶

An analysis of the operational reality of the governing structure reveals a tension between the principles laid down by the Constitution and the historically formed reality. While the Constitution positions the Diet as the "highest organ of state power," the powerful bureaucracy, a holdover from the prewar era, has maintained its substantial influence. The administrative organizations established in the Meiji period²⁴ were carried over without being fundamentally dismantled in the postwar reforms. As a result, the very fact that successive administrations, such as the Hashimoto cabinet with its central government reform²⁹ and the Nakasone cabinet with its Rinchō reforms,³³ had to repeatedly champion "administrative reform" illustrates the difficulty for politics (the Cabinet and the Diet) to bring the bureaucratic organization completely under control. This demonstrates a divergence between the ideal of the parliamentary cabinet system intended by the Constitution and the reality of bureaucratic dominance in the policy-making process, exposing an aspect where the Constitution did not fully redefine the nation's power structure.

Furthermore, the development process of civil society shows that constitutional guarantees of rights only function fully once society has matured. Although Article 21 had guaranteed freedom of association since 1947, the NPO sector did not truly take off until the national crisis of the 1995 Great Hanshin-Awaji Earthquake served as a catalyst.⁴⁸ This disaster laid bare the existence of challenges that the state alone could not handle and made the entire society recognize the need for organized civic action. This led to the realization of concrete legal frameworks like the NPO Act. This time lag of nearly 50 years suggests that for the rights written in the Constitution to be more than just "a picture of a rice cake" (pie in the sky), a social and political process is indispensable, where society demands the exercise of those rights and concrete laws and systems are established to support them. The effectiveness of the Constitution is determined not only by its text but also by the will of the people to utilize it and the political will to respond.

Part III: A Quantitative Analysis of National Development Under the Constitution

Section 4: The Trajectory of the Economy and Public Finance

4.1 Macroeconomic Performance The postwar Japanese economy achieved remarkable development under the stable social foundation guaranteed by the Constitution. The Nikkei Stock Average and the TOPIX (Tokyo Stock Price Index) have mirrored the dynamism of the Japanese economy: the high-growth era, the bubble economy and its collapse, and the subsequent long-term stagnation and recent recovery.⁵⁷ The trajectory of GDP also clearly shows the path from a miraculous recovery to becoming a global economic powerhouse, followed by a transition to an era of maturity and stagnation.

4.2 National Public Finance Japan's national public finance has a dual structure: the "General Account," which is easily visible to the public, and the "Special Accounts," which are several times larger in scale and whose actual state is difficult to grasp.

Table 1: Trends in General and Special Account Expenditure Settlement Amounts (Selected Fiscal Years)

Fiscal YearGeneral Account Expenditure (trillion yen)Special Account Expenditure (net, trillion yen)Ratio (Special/General)198043.748.91.12199066.287.51.32200081.4167.32.06201090.7180.51.992020155.3451.92.912022132.4433.03.27Source: Compiled based on data from the Ministry of Finance, etc. Special Account figures are on a net settlement basis.

As this table shows, the scale of the Special Accounts has consistently exceeded that of the General Account, and the gap has tended to widen in recent years. This structure is extremely important for understanding Japan's fiscal situation.

4.3 The "Kasumigaseki Buried Treasure": Problems with Special Accounts Special Accounts are established to allocate specific revenues for specific projects, but their lack of transparency has been criticized for many years. As derisively described, "While the main house is sipping rice gruel, they're eating sukiyaki in the detached parlor,"⁵⁹ huge surpluses (the so-called "Kasumigaseki buried treasure") have accumulated in the Special Accounts while fiscal austerity is being called for in the General Account.⁶⁰ Reports by the Board of Audit have repeatedly pointed out issues such as the normalization of large carried-over funds and unused amounts, and the ambiguity of standards for holding reserves.⁵⁹ In response, reforms such as the consolidation and abolition of Special Accounts and strengthening of information disclosure have been promoted,⁶² but challenges regarding their effectiveness remain.

4.4 Corporate Performance According to the Financial Statements Statistics of Corporations by Industry,⁶⁴ the sales and profit margins of Japanese companies have fluctuated significantly, reflecting economic globalization and changes in industrial structure. During the long recession following the collapse of the bubble economy, many companies struggled with declining profitability, but they have since achieved recovery and transformation through restructuring and the development of emerging markets.

Section 5: Sociodemographic and Welfare Trends

5.1 Demographic Changes Postwar Japanese society has experienced dramatic demographic changes. The total population peaked in 2008 and has since been in decline, with rapid aging and a falling birthrate.⁶⁷

Table 2: Trends in Demographics and Naturalized Citizens (Selected Years)

YearTotal Population (10k)Aging Rate (%)Working-Age Population Ratio (%)Annual Naturalizations (persons)197010,4677.168.96,053198011,7069.167.46,340199012,36112.169.710,649200012,69317.466.115,813201012,80623.063.810,910202012,61528.659.58,3652070 (est.)8,70038.752.1-Source: Compiled based on National Census, Population Estimates,⁶⁸ and Ministry of Justice data.⁷⁶

This table clearly shows the structural challenge of a declining working-age population, which supports society, and an increasing elderly population, which is supported. Meanwhile, the number of foreigners acquiring Japanese nationality has remained around 10,000 per year, with their countries of origin tending to diversify.⁷⁷

5.2 Cost of Living and Healthcare The trends in the Consumer Price Index (CPI), which directly affects people's perception of their daily lives, and national medical care expenditures are important indicators for measuring economic stability and the sustainability of social security.

Table 3: Comparison of Year-on-Year Growth Rates of CPI, National Medical Expenditures, and Nominal GDP (Selected Years)

Fiscal YearCPI (General)National Medical ExpendituresNominal GDP1980+7.7%+9.9%+8.9%1990+3.1%+6.7%+7.6%2000-0.7%-1.8%+0.1%2010-0.7%+3.9%+2.3%20200.0%-3.2%-3.9%2022+2.5%+3.7%+1.3%Source: Compiled based on data from the Statistics Bureau of the Ministry of Internal Affairs and Communications,⁷⁹ Ministry of Health, Labour and Welfare,⁸² and Cabinet Office.

This table reveals that, especially since the 2000s, the growth in national medical expenditures has tended to outpace GDP growth amid economic stagnation. This suggests that pressure on the social security system is increasing year by year.

5.3 The Social Security System: The High-Cost Medical Expense Benefit System At the core of Japan's social security system are the universal health insurance system and its safety net, the High-Cost Medical Expense Benefit System. Established in 1973, this system prevents out-of-pocket medical expenses from becoming excessive. It has been expanded through numerous revisions, such as expanding the scope of beneficiaries and introducing a "benefits-in-kind" system that limits payments at the point of service to the co-payment ceiling (for inpatient care in 2007, outpatient care in 2012).⁸⁴ However, with the aging population and advancements in medical technology, the financial resources needed to support the system are growing annually, making its sustainability a major challenge.⁸⁹

This quantitative data highlights a serious divergence between the ideals espoused by the Constitution of Japan and the societal reality in which it operates. Article 25 guarantees the "right to maintain the minimum standards of wholesome and cultured living," an ideal embodied in world-class social security systems like universal health insurance and the High-Cost Medical Expense Benefit System. However, the sustainability of this system is being fundamentally shaken by the irresistible reality of demographic change. The demographic shift, with a sharp decline in the working-age population and a surge in the elderly population,⁶⁷ is causing the balance between social security contributors and beneficiaries to collapse. Furthermore, the situation where the growth of national medical expenditures consistently outpaces economic growth⁸² is accelerating this structural crisis. In short, the welfare state ideal promised to the people by the Constitution is facing a situation where its very economic and demographic foundations are eroding. This is not a flaw in the constitutional text itself, but a more fundamental problem where the social cost of maintaining the constitutional ideal is exceeding acceptable limits due to social changes that could not have been foreseen at the time of its enactment.

At the same time, from the perspective of fiscal transparency, it is difficult to say that the ideals of the Constitution are functioning sufficiently. The principle of popular sovereignty presupposes that the people control national finances through their representatives in the Diet (Article 83). However, the reality that massive funds, several times the size of the General Account, are managed in the "black box" of Special Accounts, which are hard for the public or the Diet to adequately scrutinize,⁵⁹ threatens to render this principle of fiscal democracy a mere formality. If the people cannot accurately grasp how their resources are being used, then popular sovereignty is only incompletely realized in the core state activity of public finance. This is not simply a technical accounting issue but a serious governance flaw related to the fundamental principles of government laid down by the Constitution.

Part IV: The People's Experience: Changes in Lifestyle and Culture

Section 6: Japanese Lifestyles: From Postwar Hardship to Modern Diversity

6.1 The Changing Face of the Family The transformation of the family unit is most symbolic of the structural changes in postwar Japanese society. The once-standard "household of a married couple with children" plummeted from 42.1% in 1980 to 26.9% in 2015, now constituting a minority.⁹⁰ In their place, "single-person households" and "couple-only households" have surged, with single-person households now being the most common household type.⁹¹ Behind this is an increase in elderly people living alone due to aging, as well as the progression of later marriages and non-marriage.⁹⁰ This change can be seen as a manifestation of the ideals of Article 24 of the Constitution—individual dignity and the equality of the sexes—permeating society, marking a shift from the patriarchal ie (household) system of the prewar era to a family view based on the individual.

6.2 Evolution of the Work Environment Japan's employment practices have also undergone a major transformation. The "Japanese-style employment" practices of lifetime employment and seniority-based wages, which took root during the high-growth era, supported the international competitiveness of companies but also created an inflexible labor market.⁹⁵ However, amid the long recession after the collapse of the bubble economy and the advance of globalization, these practices gradually changed, and performance-based systems and the expansion of non-regular employment progressed.

A particularly significant change has been the advancement of women in society. Before the war, paths for women to enter professional occupations were extremely limited.⁹⁸ After the war, buoyed by the constitutional guarantee of gender equality, women's educational standards improved, and their entry into the workforce advanced.¹⁰⁰ A landmark event was the enactment of the Equal Employment Opportunity Act in 1985, which legally prohibited gender discrimination in recruitment, hiring, promotion, and other areas.⁹⁸ Since then, legal systems have been put in place to create an environment where women can continue to work, such as the Act on Promotion of Women's Participation and Advancement in the Workplace in 2015.¹⁰¹ This represents a long process of giving concrete form to the ideals of Article 14 (equality under the law) and Article 24 in the socio-economic sphere.

Section 7: Cultural Identity in the Age of Globalization

7.1 Constitutional Freedoms and the Flowering of Postwar Culture The freedom of expression guaranteed by Article 21 liberated Japanese culture from prewar militaristic censorship and became the soil for diverse creative activities. In the postwar era, literature, film, and popular culture blossomed, with films by directors like Akira Kurosawa gaining international acclaim.¹⁰³, ¹⁰⁴ The spread of television further promoted the popularization of culture and had a major impact on people's lives.¹⁰⁴ Freedom of expression has also protected artistic expressions that sometimes cause controversy, playing an indispensable role in supporting social diversity and a healthy democracy.¹⁰⁶

7.2 The Dual Impact of Globalization Postwar, particularly under the U.S.-Japan Security Treaty, Japan absorbed a massive amount of culture from the Western world, centered on the United States.¹⁰⁸ Westernization progressed in all aspects of lifestyle, including diet, fashion, music, and movies.¹⁰⁹ However, this cultural inflow was not one-sided. The advance of globalization also became a powerful driving force for disseminating Japanese culture to the world. Japanese content and culture, such as anime, manga, games, and "Washoku" (Japanese cuisine), have gained global popularity as "Cool Japan," and Japan has become a major exporter of culture.¹¹⁰ As a result, contemporary Japan is both a huge importer and exporter of culture, in a dynamic situation of constantly questioning and reconstructing its own identity within a global context.¹¹⁴

Data on family structure and female employment show that a large gap still exists between the ideals set forth in the Constitution and social reality. While Article 24 loudly proclaimed the equality of the sexes in 1947,¹¹⁶ the Equal Employment Opportunity Act, designed to realize that ideal in society, was not enacted until 38 years later, in 1985.⁹⁸ Even today, structural inequalities, such as the gender wage gap and the low percentage of women in leadership positions, have not been resolved. This suggests that while the Constitution served as a "detonator" for social change, for its ideals to permeate every corner of the socio-economy, a more time-consuming process of changing deep-rooted customs and attitudes is necessary, in addition to legal reforms. The Constitution is, in a sense, an "unfinished revolution," and the complete realization of its ideals remains an ongoing task.

On the other hand, looking at cultural transformation, the effectiveness of the free framework provided by the Constitution is evident. The inflow of foreign culture due to globalization did not lead to the loss of Japanese culture or simple Westernization. Instead, it promoted a process that could be called "glocalization,"¹¹⁰ incorporating foreign elements into a Japanese context to create new value. For example, foreign food cultures were arranged to suit Japanese tastes, and Japanese anime and games developed uniquely while incorporating foreign myths and stories.¹¹⁰ This cultural dynamism indicates that the freedom of expression guaranteed by the Constitution has functioned as a robust foundation for society to adapt flexibly and creatively to external pressures. The liberal framework of the Constitution can be said to have been effective in fostering the richness and diversity of culture, rather than its homogenization.

Part V: A Comparative Constitutional Perspective and International Discourse

Section 8: The Constitution of Japan in a Global Context

8.1 A Comparison of Governance Systems The characteristics of Japan's parliamentary cabinet system become clearer when compared with the governance systems of other countries. In the United States' presidential system, based on a strict separation of powers, the president (head of the executive branch) and Congress (the legislative branch) are chosen in separate elections and are independent of each other.¹¹⁸ France's semi-presidential system is a hybrid where a powerful, directly elected president and a prime minister who requires the confidence of the parliament share executive power.¹¹⁹ Even when compared to the UK and Germany, which also employ a parliamentary cabinet system, Japan's system exhibits unique features in the prime minister's authority, the nature of coalition governments, and the relationship between the cabinet and the parliament.¹²⁴

8.2 A Comparison of Judicial Review Systems Following the American model, Japan has adopted a "diffuse system of judicial review," where all courts, with the Supreme Court at the apex, can review the constitutionality of laws and ordinances in the context of specific legal cases.¹²⁷ This contrasts with the constitutional court model of countries like Germany, which allows for "abstract review" of a law's constitutionality separate from a specific case.¹²⁷ A distinctive feature of its operation is that in its long history, the Supreme Court of Japan has found very few laws to be unconstitutional, a tendency often described as "judicial passivism."¹²⁸

8.3 A Comparison of Constitutional Principles

• Pacifism: While Article 9 of the Constitution of Japan is known as the world's most stringent pacifist provision, 158 out of 188 countries (84%) have constitutions with clauses that mention peace in some form.¹³² Japan's uniqueness lies in the broad scope of its ideal and the specific provision for the "non-maintenance of war potential."

• Guarantee of Human Rights: The guarantee of fundamental human rights in the Japanese Constitution is based on the idea that they are natural rights that predate the state, sharing the universal values of modern constitutionalism.¹⁸

• Constitutional Amendment Procedures: The stringency of Japan's constitutional amendment procedure is striking in international comparison.

Table 4: Comparison of Constitutional Amendment Procedures in Major Countries

CountryInitiating BodyLegislative Vote RequirementNational ReferendumPostwar AmendmentsJapanDiet2/3 of all members in each HouseMandatory0USACongress / States2/3 of both HousesNot required (ratification by 3/4 of states)6GermanyParliament2/3 of both HousesNot required (in principle)67FrancePresident / ParliamentMajority in both HousesMandatory (can be bypassed by 3/5 vote in joint session)27ItalyParliamentTwo votes in each House (2nd is absolute majority)Optional (if 2nd vote is less than 2/3)19UK-Same as ordinary lawNot required (but used for major issues)-S. KoreaPresident / Diet2/3 of sitting membersMandatory9Source: Compiled based on national constitutions and comparative research materials.¹³⁴

As is clear from this table, Japan's amendment procedure is a "double lock" system, combining a high legislative hurdle with a mandatory national referendum, making it one of the most rigid constitutions in the world. This institutional design itself is the single largest structural factor for why the constitution has never been amended.

Section 9: Global Discourse on the Constitution of Japan

Discussions surrounding the Constitution of Japan have been developed from various standpoints, both domestic and international.

• Japanese Constitutional Scholars:

  • Nobuyoshi Ashibe, a titan of constitutional law, advocated for a "moderate judicial activism," based on a fundamental "judicial passivism" that cautions against excessive judicial intervention in politics, but argued that courts should play an active role in protecting human rights.¹³⁸

  • Yasuo Hasebe, a leading contemporary scholar, argues for a "moderate pacifism" that allows for a self-defense organization rather than absolute disarmament, from the perspective of "constitutionalism" which guarantees the coexistence of diverse values. He has severely criticized the cabinet's reinterpretation allowing for the exercise of the right of collective self-defense as unconstitutional, arguing it goes beyond the logical framework of previous government interpretations.¹⁴⁰

  • Isao Satō contributed to the widespread understanding of the constitution by explaining its basic principles in plain language.¹⁴⁶

• Political Leaders:

  • Former Prime Minister Yasuhiro Nakasone consistently advocated for the establishment of an "autonomous constitution" and presented concrete amendment proposals that included clarifying the Emperor's position as head of state, the duty of national defense, and an emergency powers clause.¹⁴⁸

  • Former Prime Minister Shinzō Abe, who led the recent push for amendment, made it his top priority to explicitly mention the Self-Defense Forces in Article 9.¹⁵³

• Historical Figures:

  • Douglas MacArthur, who as Supreme Commander for the Allied Powers led the enactment of the constitution, is said to have initially intended a very strict demilitarization that would renounce even wars of self-defense.⁸

  • Beate Sirota Gordon, who at the age of 22 was in charge of drafting the human rights clauses, particularly Article 14 and Article 24 on gender equality, was passionate about guaranteeing women's rights based on her experience witnessing the rightless status of women in prewar Japan.¹¹⁶

• International Perspectives:

  • American historian John W. Dower, in his book Embracing Defeat, argues against viewing the Constitution of Japan as merely "imposed." Instead, he meticulously details the process by which the Japanese populace, in response to the "revolution from above" of the occupation, proactively embraced the ideals of democracy and made them their own.¹⁵⁶

International comparison reveals a striking feature of Japan's governance system: the "quietness of the judiciary."¹²⁸ While the system incorporates a powerful American-style power of judicial review,¹²⁷ its actual application is extremely restrained. In stark contrast to the U.S. Supreme Court or Germany's Federal Constitutional Court, which often make far-reaching constitutional judgments on core political issues, Japan's Supreme Court tends to avoid ruling on key controversies like the constitutionality of the Self-Defense Forces, using doctrines such as the "political question" doctrine. As a result, the role of constitutional interpretation, which should be borne by the judiciary, has been de facto delegated to an executive branch agency, the Cabinet Legislation Bureau—an exceptional situation from a separation of powers perspective. This means that the system of checks and balances envisioned by the Constitution is not functioning sufficiently due to the self-restraint of the judicial branch, making it a structural anomaly in Japan's governance.

Furthermore, an analysis of the domestic and international discourse on constitutional revision reveals that this debate is not merely about technical amendments to the text, but a conflict over national identity at a deeper level. The revisionist arguments, represented by figures like Nakasone and Abe, contain a nationalist orientation seeking an "autonomous constitution" that more strongly reflects Japan's history and traditions, through measures like amending the Preamble, making the Emperor the head of state, and formally positioning the military.¹⁴⁸ In contrast, the pro-constitution or cautious stance, represented by many constitutional scholars, argues that the ideals of pacifism and universal human rights enshrined in the constitution are the very foundation of postwar Japan's success and its trust from the international community, and are the identity that must be protected. Therefore, the constitutional amendment debate has taken on the aspect of a proxy war over the very image of the nation: whether 21st-century Japan should aim to be a "nation rooted in its unique traditions" or continue on the path of a "universalist and pacifist ideal state."

Part VI: Conclusion and Strategic Proposals

Section 10: A Comprehensive Evaluation of Efficacy and Ineffectiveness

10.1 The Unwavering Efficacy of the Constitution For over 75 years since its enforcement, the Constitution of Japan has functioned as the cornerstone of Japan's peace and stability. Its greatest achievement is having established the fundamental principles of popular sovereignty, respect for fundamental human rights, and pacifism in society, building the foundation of an unshakable democratic nation. In particular, the guarantee of fundamental human rights promoted social modernization, including gender equality, and enabled the development of a free space for speech and a vibrant civil society. Under this constitution, Japan has achieved economic prosperity and social maturity without once engaging in war. This is the strongest evidence that the constitution has functioned extremely effectively for its people.

10.2 The Emergence of the Constitution's Ineffectiveness On the other hand, with the long passage of time since its enactment, aspects of "ineffectiveness," where the constitution is not fully able to address the challenges of modern society, have become apparent. First, its extreme rigidity (difficulty of amendment) is hindering adaptation to changing times. In particular, dealing with the drastic changes in the international security environment by merely reinterpreting Article 9 has its limits. Second, the lack of an emergency powers clause to deal with situations that threaten the nation's existence, such as large-scale disasters, pandemics, or armed attacks, is pointed out as a vulnerability in crisis management. Third, the sustainability of the welfare state ideal guaranteed by Article 25 is being fundamentally questioned amid the reality of a severe aging population and fiscal constraints. Furthermore, a significant gap still exists between the constitution's ideals and socio-political reality in areas such as gender equality and the control of the bureaucracy.

Section 11: A Path to Reform: Practical Policy Proposals

11.1 The Option of Constitutional Amendment The constitutional amendment proposals currently being discussed, mainly by the Liberal Democratic Party, are concentrated on the following points.¹⁵⁹

• Explicitly Mentioning the Self-Defense Forces in Article 9: This aims to resolve the discrepancy between the constitutional text and the reality of the SDF's existence, providing a clear constitutional basis for their activities. In response, there are strong concerns that the pacifist ideals of Article 9 would be hollowed out.¹⁵³

• Creating an Emergency Powers Clause: Proposals have been made to create new provisions that would, for example, specially extend the terms of Diet members during large-scale disasters or grant temporary concentration of power to the cabinet. While proponents argue this would strengthen crisis response capabilities, there are counterarguments about the danger of abuse of power and that responses are possible under the current legal system.¹⁶¹

• New Human Rights Provisions: There is also discussion about incorporating new rights not explicitly stated in the current constitution to respond to changing times, such as environmental rights.¹⁶⁷

Any amendment would need to overcome challenges related to the operation of the national referendum law (e.g., advertising regulations, the presence or absence of a minimum turnout rate) and clear the extremely high hurdle of forming a broad national consensus.¹⁷²

11.2 Reforming the Governance Structure Without Constitutional Amendment Many of the challenges facing Japan's governance do not necessarily require the major surgery of constitutional amendment. More realistic and effective reforms that can be implemented within the constitutional framework exist.¹⁷⁸

• Legislative and Administrative Reform: Revise the Diet Act to strengthen the Diet's oversight function of the administration. In particular, fundamentally strengthen the Diet's authority to review the budgets and accounts of Special Accounts to ensure fiscal transparency. Further advance reforms of the bureaucratic personnel system to enhance expertise and ensure thorough accountability to political leadership.

• Judicial Reform: Introduce mechanisms for the Diet and the public to be more involved in the appointment process of Supreme Court Justices to promote judicial diversity and proactiveness. This would encourage the courts to more independently fulfill their role as the guardian of the constitution.

• Deepening Decentralization: Promote further transfer of authority and reallocation of tax and financial resources from the national to local governments, strengthening the system for regions to tackle their own challenges based on their own judgment and responsibility.

11.3 A Vision for the Future The most effective approach to the challenges facing the Constitution of Japan is to pursue two paths simultaneously. One is to focus on issues where a clear mismatch with the demands of modern society has arisen, such as Article 9 and the emergency powers clause, and to advance a calm and constructive, non-partisan debate on constitutional revision, aiming to form a national consensus. The other is, in parallel, to resolutely carry out "reforms without constitutional amendment"—such as enacting and amending laws and improving institutional operations—to rectify the dysfunctions of the governing structure without waiting for amendment. This dual-track approach is the wisest path forward to adapt to the harsh realities of the 21st century while respecting the legacy of peace and democracy built by the Constitution of Japan.

References and Mentioned Individuals

Links to information on the main individuals mentioned in this report are as follows:

• Nobuyoshi Ashibe (芦部 信喜): Constitutional scholar. Professor Emeritus at the University of Tokyo. Established the prevailing theory in Japanese constitutional law scholarship. [Related Info]

• Yasuo Hasebe (長谷部 恭男): Constitutional scholar. Professor at Waseda University, Professor Emeritus at the University of Tokyo. Develops contemporary constitutional interpretation from the perspective of constitutionalism. [Related Info]

• Isao Satō (佐藤 功): Constitutional scholar and former President of the National Personnel Authority. Was involved in the constitution-making process and is known for his accessible commentaries. [Related Info]

• Shinzō Abe (安倍 晋三): 90th, 96th, 97th, and 98th Prime Minister of Japan. Led the debate on constitutional revision, advocating for the explicit mention of the Self-Defense Forces in Article 9. [Related Info]

• Yasuhiro Nakasone (中曽根 康弘): 71st, 72nd, and 73rd Prime Minister of Japan. Called for a "final settlement of postwar politics" and made the establishment of an autonomous constitution his life's work. [Related Info]

• Douglas MacArthur: Supreme Commander for the Allied Powers. Known for the "MacArthur Notes," which laid out the basic principles of the Constitution of Japan. [Related Info]

• Beate Sirota Gordon: Staff member of GHQ's Government Section. At the age of 22, she was instrumental in drafting the human rights clauses of the constitution, particularly Article 24, which provides for gender equality. [Related Info]

• John W. Dower: American historian. His book Embracing Defeat, which depicts Japanese society and culture under the occupation from the perspective of the populace, won the Pulitzer Prize. [Related Info]