Does Japan Have a Language Policy? — Japanese in an Immigrant Society and the Era of AI Translation —

1. Japan has no "official language"

There is no law in Japan that stipulates "the official language is Japanese."
Neither the Constitution nor general laws contain any provisions that explicitly state an official language.

This is rare from a global perspective.

In many countries, the state and language are linked by law.
However, no such provision exists in Japan.

Looking at this fact alone, in principle, in Japan,it is free to use any languageis the case.

2. Japan is already a quasi-immigrant society

Discussions on such language policies are often spoken of as future issues.
However, looking at demographic statistics, the composition of Japanese society has already begun to change.

According to the Immigration Services Agency of Japan, as of June 2025, the number of foreigners residing in Japan has reachedapproximately 3.95 million.
This accounts fora little over 3%of the total population, which is the highest level on record.

The pace of increase is also fast.

• 2023: Approximately 3.41 million

• 2024: Approximately 3.77 million

• 2025: Approximately 3.95 million

Thus, in the last few years, it hasincreased by more than 500,000.

Also, foreign workers working in Japan haveexceeded 2.3 million, and they play important roles in many industries such as manufacturing, construction, nursing care, and food service.

On the other hand, the Japanese population is decreasing at a scale of800,000 to 900,000 per year.

As a result, in Japanese society,

the Japanese population is decreasing and the foreign population is increasing

is a change in demographic structure that is progressing.

Of course, Japan's ratio of foreigners is still low compared to Western immigrant nations.
However, considering the speed of the increase, it can be seen that Japanese society is alreadyentering the stage of a quasi-immigrant society.

3. Language freedom and the risk of ghettoization

When a language is not unified by a system, language communities naturally form within society.

People who speak the same language gather and share a living sphere.
This is a phenomenon seen in cities all over the world.

However, when this phenomenon becomes fixed, it leads to a state known in sociology as ghettoization.

Ghettoization is a phenomenon where specific ethnic or immigrant groups concentrate in a certain area, weakening their contact with mainstream society.

As ghettoization progresses,

• educational disparities

• employment disparities

• social fragmentation

and the like are likely to occur.

Furthermore, as access to social systems weakens, connections to administrative and legal systems diminish, which may also affect social order.

In a society without a language policy, this problem may become apparent.

4. Japan's "Invisible Language Policy"

However, looking at actual Japanese society, language is not completely free.

Systems such as administration, education, and the judiciary are all operated in Japanese.

For example, Article 74 of the Court Act states

is stipulated as such.

In other words, although there is no law in Japan that explicitly states an official language, the system itself is constructed in Japanese.

Through this mechanism, Japanese has become a de facto requirement for social participation.

Japan's language policy is not declared by law, but is considered to function as an "invisible policy" embedded in its institutional structure.

5. The Emergence of Japanese Language Education Policy

This "invisible policy" has persisted for a long time, but a shift has begun in recent years.

The Act on the Promotion of Japanese Language Education enacted in 2019 (enacted and enforced in June 2019)
Japanese Language Education Promotion Act
is the first law to position Japanese language education as a national policy.

This law repositioned Japanese language education from

individual effort to a social infrastructure.

In other words, Japan is beginning to transition from an implicit language policy to an explicit policy.

6. Language and Social Institutions

Language is not merely a tool for communication.
It is also the foundation that establishes social institutions themselves.

In philosophy, this is called speech acts.

For example,

• concluding a contract

• taking an oath

• pronouncing a judgment

• establishing rules

are all actions established through language.

In other words, the act of speaking itself becomes a social act.

In this sense, social institutions are supported by a common language.

For administrative procedures, contracts, trials, and police activities to function, participants must share the same linguistic rules.

A common language is not only a matter of culture, but also the foundation of social institutions and public order.

7. The New Situation Brought About by AI Translation

Furthermore, the very premises of language policy are currently changing.
This is due to the progress of AI translation, represented by Large Language Models (LLMs).

Until now, language policy in immigrant societies has mainly offered two options.

• Immigrants learn the local language: Assimilation Model

• The state institutionalizes multiple languages: Multilingual Model

However, AI translation creates a third possibility.

That is a translation infrastructure society.

If real-time translation becomes widespread, people will be able to communicate while remaining in their native languages.

8. Separation of Social Language and Communicative Language

As AI translation becomes widespread, the roles of language may split into two.

Social language: Language that supports administration, education, and institutions
Communicative language: Language used through translation for international exchange and business

In this structure, the language that forms the foundation of society is maintained, while international communication is supported by translation.

9. The Future of Japanese Society

In Japan, there is ongoing debate for and against the acceptance of immigrants.
However, in reality, due to the increase in foreign residents, Japanese society is already entering the stage of a quasi-immigrant society.

In such a situation, designing a language policy is not easy.

On one hand, it is necessary to maintain social integration through the Japanese language.
On the other hand, in a society with an increasing number of foreign residents, there is also a need to respond to linguistic diversity.

However, Japan has no tradition of clearly defining an official language by law, and introducing a strong legal language policy may not necessarily fit the society.
At the same time, if language policy is left entirely to laissez-faire, it could lead to imbalances in access to social institutions or social fragmentation.

Thus, designing a 'loose language policy' as a system is itself a difficult challenge.

In this context, one realistic direction to consider is ensuring access to translation infrastructure, including AI translation.

While maintaining Japanese as a common language as the foundation of social institutions, translation technology can lower the barriers to communication.
Such a mechanism can play a role in expanding opportunities for social participation while simultaneously maintaining connection to institutions.

Ensuring communication is not merely a matter of convenience.
In areas such as administrative procedures, legal systems, and relationships with local communities,the formation of a shared understanding also leads to the maintenance of social order and public safety.

In an era where AI translation is becoming widespread, language policy is shifting from the question of "which language to adopt" to the challenge of
how to design society by combining social languages and translation infrastructure.

Rather than fixing language to a single form, it is about increasing the circuits of understanding.
That may well be one aspect of Japan's language policy in the age of AI translation.

Please feel free to take a look at this as well.

【メッセージ】
最後までお読みいただき感謝いたします。

拙い文章ですが、ロジカルな文章よりも感情を揺さぶるような文章を書きたいと思っています。
これからも、是非ともよろしくお願いいたします。
余韻のために最後は1ページ程度の空白を置いています。何か感じていただければと。
今日は楽しかった、悲しかった、悔しかった、嬉しかったなど、そういう感情が動く体験は、
記憶され、そして未来の判断になんらかの影響を与えると思います。そうだといいな。

【プロフィール】
2児の父です。 駄文・乱文ですみませんが、普通の人生を記していきます。コッソリと・・・ 
凡人なので、フォロバ100です。人としては、フォローされるよりフォローできる人間でありたい。 
ちなみに自己紹介にスキはフォローＯＫと受け止めます。 
「Amazonのアソシエイトとして、T(パパ）は適格販売により収入を得ています。」
あと、noteにも感謝です。
見出しの写真やイラストはnoteユーザー様のを使わせて頂いています。こちらも感謝いたします。

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