Home / Japanese Paternity Acknowledgment Translation
Certified Japanese Paternity Acknowledgment Translation
Certified translation of the documents that establish paternity in Japan, including the registry annotations and endorsements that carry the legal effect and that a reader unfamiliar with the system will otherwise skip.
$24.95/page
Flat rate per page, up to 250 words. No hidden fees.
100% USCIS acceptance
Every certified translation is guaranteed to be accepted by USCIS.
24-hour delivery
Most 1-3 page documents are delivered within 24 hours. Same-day available.
Ninchi, and what it does in the koseki
Japanese acknowledgment is ninchi (認知), filed at a municipal office and recorded in the koseki, the family register. It establishes the legal parent-child relationship for a child born outside marriage and it is irrevocable once filed.
The koseki is organised by household rather than by individual, so an acknowledged child may appear in the mother's koseki with the acknowledgment noted, rather than moving to the father's. The register entry states what happened and we translate it as written.
Nationality, and the 2008 decision
Japanese nationality for a child born abroad to a Japanese father and a non-Japanese mother once required that the parents marry. The Supreme Court held that requirement unconstitutional in 2008, and the Nationality Act was amended so that acknowledgment alone can ground nationality.
That matters in a great many US-Japan family files, and it means an acknowledgment made after 2008 has consequences an older reader of the law would not expect. Prenatal acknowledgment — taiji ninchi, filed before birth — is also available and is common precisely for nationality reasons.
The registers that hold the history
Japan computerised the koseki, and entries from the previous paper register may not carry over — the kaisei genkoseki (改製原戸籍) holds them. A register a family has left is a joseki.
So an acknowledgment from before computerisation may be invisible on the current koseki tōhon. If the register shows nothing, ask for the kaisei genkoseki before concluding it never happened.
The surname, and the family court
Acknowledgment does not change the child's surname or move them into the father's koseki. That requires a separate application to the family court for permission to change the surname, followed by a filing at the municipal office.
Two more documents, and a US reader expecting the acknowledgment alone to have done it will find the child still under the mother's name. See our Japanese birth certificate page.
Ordering, and what the certification covers
Upload the document, choose certified translation at $24.95 per page of up to 250 words, and it comes back typically within 24 hours as a PDF formatted to mirror the original, with a signed certificate of translation accuracy on letterhead. Marginal annotations are translated in place, in the margin, and every seal, stamp and registry endorsement is translated with the text. See how we translate and certified versus standard.
Frequently asked questions
Can ninchi be withdrawn?
No. It is irrevocable once filed, though it may be challenged in defined circumstances.
Does acknowledgment give the child Japanese nationality?
Since the 2008 Supreme Court decision and the amendment that followed, acknowledgment alone can ground nationality. Prenatal acknowledgment is also available.
My koseki shows no acknowledgment.
Computerisation left older entries behind. Ask for the kaisei genkoseki, the pre-computerisation original.
Does the child take the father's surname?
Not automatically. It needs family court permission and a further municipal filing.
Ready to get started?
Upload the document and receive the certified translation, typically within 24 hours.