Military/state service — no nationality pathway (positive N/A)
Citizenship in Japan
- Eligibility
- The Self-Defense Forces accept Japanese citizens only; no service-based naturalization. Const. Art.9 context; Nationality Act acquisition list (Arts.2-9,17) is closed.
- Renunciation
- Not required
Who qualifies
- Positive N/A — there is no military- or service-based route to Japanese citizenship: the Self-Defense Forces accept only Japanese citizens, and the constitutional renunciation of war and armed forces (Const. Art. 9) is the structural reason a military-service-to-citizenship path does not exist.
Legal basis
Primary legal authorities: Nationality Act (Act No. 147 of 1950, as amended). Status: Historical / superseded (operative_today: false). Administering authority: Ministry of Justice (法務省), Civil Affairs Bureau, via the Legal Affairs Bureaus (法務局); consular missions (外務省) for notifications/applications filed abroad. The Self-Defense Forces accept Japanese citizens only; no service-based naturalization. Const. Art.9 context; Nationality Act acquisition list (Arts.2-9,17) is closed.
Informational summary compiled from primary legal sources — not legal advice. Citizenship law changes; verify with the competent authority before acting. Last verified 2026-06-21.
Track changes to this route
Descent and naturalization rules change. We'll email you in plain English when anything affecting Japan updates — no spam.