How do you apply for Acquisition by acknowledgment (acknowledged children)?

• An Art. 3 acknowledged-child nationality-acquisition notification for a person under 15 is made by the statutory agent (legal representative) on the person's behalf. - Where the person effecting a nationality act — Art. 3(1) acknowledged-children acquisition, Art. 17(1) reacquisition, a selection declaration, or an Art. 13 renunciation notification — is under 15 years of age, the act is performed by the statutory agent (法定代理人) on the person's behalf (Nationality Act Art. 18).

Do you have to renounce your current citizenship for Acquisition by acknowledgment (acknowledged children)?

No — this Japan route does not require renouncing your current citizenship.

DescentJP-DSC-02

Acquisition by acknowledgment (acknowledged children)

Q: How long does Acquisition by acknowledgment (acknowledged children) take?

• Nationality acquired by an acknowledged child under Art. 3 takes effect at the time the notification is made (accepted) to the Minister of Justice. - Where nationality is acquired under Nationality Act Art. 3(1) (acknowledged children) or Art. 17(1)/(2) (reacquisition by notification), the nationality-acquisition notification to the koseki must be filed within 1 month of acquisition, or 3 months if the person is abroad on the acquisition date (Family Register Act Art. 102(1)).

Citizenship in Japan

Eligibility: Child under 18 acknowledged by a Japanese parent acquires nationality by notification to the Minister of Justice if the parent was Japanese at the child's birth and is/was Japanese (Art.3(1)); Art.3(3) guards against false acknowledgment (added Act 88/2008 after SC Grand Bench 2008-06-04 struck the prior marriage requirement).
Renunciation: Not required

Who qualifies

A child under 18 who is acknowledged (認知) by a father or mother may acquire Japanese nationality by notification to the Minister of Justice, where the acknowledging parent was a Japanese national at the child's birth AND is currently a Japanese national (or was Japanese at death); a person who was once Japanese is excluded. - Art. 3 applies to acknowledgment by a father OR a mother (父又は母が認知した子) on its face; in practice acknowledgment (認知) principally operates as a paternity mechanism, with maternal cases typically resolving under Art. 2(i) by the fact of birth.

How to apply

An Art. 3 acknowledged-child nationality-acquisition notification for a person under 15 is made by the statutory agent (legal representative) on the person's behalf. - Where the person effecting a nationality act — Art. 3(1) acknowledged-children acquisition, Art. 17(1) reacquisition, a selection declaration, or an Art. 13 renunciation notification — is under 15 years of age, the act is performed by the statutory agent (法定代理人) on the person's behalf (Nationality Act Art. 18).

Timeline

Nationality acquired by an acknowledged child under Art. 3 takes effect at the time the notification is made (accepted) to the Minister of Justice. - Where nationality is acquired under Nationality Act Art. 3(1) (acknowledged children) or Art. 17(1)/(2) (reacquisition by notification), the nationality-acquisition notification to the koseki must be filed within 1 month of acquisition, or 3 months if the person is abroad on the acquisition date (Family Register Act Art. 102(1)).

Legal basis

Primary legal authorities: Nationality Act Art.3, SC 2008-06-04 平成18(行ツ)135, Act 88/2008. Status: Operative (—present). 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. Child under 18 acknowledged by a Japanese parent acquires nationality by notification to the Minister of Justice if the parent was Japanese at the child's birth and is/was Japanese (Art.3(1)); Art.3(3) guards against false acknowledgment (added Act 88/2008 after SC Grand Bench 2008-06-04 struck the prior marriage requirement).

Example scenarios

Rio was NOT Japanese at birth. His mother, though Japanese, had not established the legal parent-child relationship for nationality purposes at birth (no acknowledgment at birth). Art. 2(i) requires the parent to be Japanese 'at the time of birth' and the legal parent-child relationship to exist at birth. Post-birth maternal acknowledgment in Japan's legal framework is the Art. 3 route for nationality acquisition. Under Art. 3(1) (JP-DSC-02): the mother (a Japanese national) acknowledged Rio; she was Japanese at his birth and is still Japanese; Rio is under 18 (he is 10). He may acquire Japanese nationality by notification to the Minister of Justice under Art. 3(1). The notification is filed at the consulate (he is abroad in Brazil). The anti-fraud guard (Art. 3(3)) requires evidence of the natural parent-child relationship. Documents required under the Enforcement Regulation: certified family registers, birth certificate, written parental statement, travel records. Acquisition takes effect at the time of notification (Art. 3(2)). Since he is under 15, the mother as statutory agent (Art. 18) files on his behalf. Koseki entry notification within 3 months (abroad).
Art. 3(1): mother Japanese at birth + currently Japanese + child under 18 + acknowledgment | Art. 2(i) did not apply at birth (no acknowledged parent-child relationship at birth) | Child under 15 → statutory agent (mother) acts (Art. 18) | Anti-fraud guard Art. 3(3) requires natural parent-child relationship evidence | Effective at time of notification (Art. 3(2))

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.

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