How to Become a Japanese Citizen: Years, Conditions and Cost
To naturalize as a Japanese citizen you generally need 5+ continuous years of residence in Japan, plus a set of common conditions: being 18 or older, good conduct, a stable livelihood, the ability to renounce your current nationality, upholding the Constitution, and everyday Japanese ability (Nationality Act Arts. 5–8). The application itself has no fee, but the final decision rests with the Legal Affairs Bureau, which weighs your overall integration into Japanese society.
Quick reference
| Item | Detail |
|---|---|
| Statute | Nationality Act, Arts. 5–8 |
| Ordinary residence | 5+ continuous years of address in Japan |
| Spouse of a Japanese national | 3 years of residence, or 3 years of marriage + 1 year of residence |
| Born in Japan / child of a former national | 3 years of residence |
| Application fee | None (certificate/translation costs apart) |
| Language | Japanese sufficient for daily life (no statutory JLPT level) |
| Decision | Minister of Justice, via the Legal Affairs Bureau |
Required years by category
The number of years depends on your ties to Japan. The figures below are the statutory minimums in the Nationality Act.
| Category | Article | Required years (guide) |
|---|---|---|
| No special ties (ordinary naturalization) | Art. 5 | 5+ continuous years of address |
| Spouse of a Japanese national | Art. 7 | 3 years of residence, or 3 years of marriage + 1 year of residence |
| Born in Japan / child of a former Japanese national | Art. 6 | 3+ continuous years |
| Biological child of a Japanese national | Art. 8 | No real residence-years requirement |
To see which category fits you and how many years remain, try the Naturalization Quiz.
The common conditions (Art. 5)
Beyond the residence years, ordinary naturalization requires all of the following:
- Capacity — 18 or older and of legal age under your home-country law.
- Good conduct — no serious issues with criminal record, taxes or traffic violations.
- Stable livelihood — you (assessed per household) can support yourself.
- Prevention of dual nationality — you can renounce your previous nationality, or you are stateless.
- Upholding the Constitution — you will respect the Constitution of Japan.
- Japanese ability — sufficient for daily life (speaking, reading and writing).
About “5 years” and “10 years” (important)
Article 5 of the Nationality Act still requires “5+ continuous years” — it has not been amended. However, guidance from the Ministry of Justice and the Legal Affairs Bureau also lists, as factors of integration into Japanese society, “everyday-level Japanese ability” and “having resided in Japan for 10+ years.” So meeting the 5-year statutory minimum does not guarantee approval, and in practice a longer residence may be taken into account. Confirm the years actually needed with your local Legal Affairs Bureau.
How much does it cost?
There is no fee for the naturalization application itself. Your real costs are for gathering documents: certificates of birth, marriage and nationality from your home country (with Japanese translations), tax certificates, and similar paperwork.
Naturalization or permanent residency?
If you want to keep your nationality and simply live in Japan indefinitely, permanent residency may suit you better. The two differ in nationality, passport, voting rights and required years — see Japan PR vs citizenship for a full comparison.
Related tools
- Check your naturalization category and remaining years → Naturalization Quiz
- Keep your nationality and stay in Japan → Permanent Residency Checker
- Reach PR faster with points → HSP Points Calculator
FAQ
How many years do I need to live in Japan to naturalize?
Ordinary naturalization requires 5+ continuous years of address in Japan (Nationality Act Art. 5). The spouse of a Japanese national needs 3 years of residence, or 3 years of marriage plus 1 year of residence (Art. 7). People born in Japan or children of former Japanese nationals need 3 years (Art. 6). Note that Ministry of Justice and Legal Affairs Bureau guidance also mentions 'having resided 10+ years' as a factor of social integration, so meeting the 5-year statutory minimum does not guarantee approval.
Is there a fee for the naturalization application?
No. The naturalization application itself has no fee. You will, however, have out-of-pocket costs for obtaining and translating certificates from your home country and Japan.
Do I have to give up my original nationality?
In principle, yes. Naturalization requires that you be able to renounce your former nationality (prevention of dual nationality), or that you are stateless. Japan does not generally allow adults to hold dual nationality, though exceptions exist where you cannot renounce by your own will.
Is there a Japanese-language test for naturalization?
There is no statutory JLPT level. The condition is Japanese ability 'sufficient for daily life' (speaking, reading and writing), which may be checked at the Legal Affairs Bureau.
Can the spouse of a Japanese national naturalize faster?
Yes. A spouse of a Japanese national can apply with 3+ years of residence, or after 3 years of marriage plus 1+ year of residence (Art. 7) — shorter than the 5 years for ordinary naturalization.
Official sources
- Ministry of Justice: Naturalization (Nationality Q&A — conditions)
- Ministry of Justice: Nationality Act (statute text)
- Tokyo Legal Affairs Bureau: conditions for naturalization
Last updated: 2026-06-13 （Nationality Act (Act No. 147 of 1950), Arts. 5–8 / adult age 18 (from 1 Apr 2022)）