Koseki-Tohon 戸籍謄本

What is a Koseki-Tohon?

A koseki-tohon (戸籍謄本, literally "family register transcript") is a certified full copy of a page in Japan's household registration system — the koseki. Every Japanese national is registered in a koseki maintained by the municipal office of their honseki, the registered place of family origin.

Unlike a partial extract, the tohon reproduces every entry on the register page: all individuals listed, their birth dates and parentage, marriage and divorce records, death registrations, adoptions, and any corrections or amendments made over time — with the reason for each change noted.

Because the honseki is a fixed administrative location (not necessarily where a person lived or was born), many overseas Japanese nationals need to request their koseki-tohon from a municipality they have never personally visited.

Koseki-Tohon vs Koseki-Shohon

There are two types of koseki extract. Understanding the difference matters because overseas authorities usually specify which one they require.

When in doubt, request the tohon. It contains everything the shohon does, plus more — so it is accepted wherever a shohon would be, but not vice versa.

What a Koseki-Tohon Records

A koseki-tohon typically contains the following information for each person registered on the page:

• Honseki — the registered municipality (city, ward, town, or village)
• Head of household and each member's relationship to the head
• Full legal name in kanji, with the official reading (yomi)
• Date and place of birth
• Parentage — father's and mother's names as registered
• Marriage and divorce records, including dates and the other party's name and honseki
• Adoptions and acknowledgements of paternity
• Death registrations
• Transfers in and out of this register page, with dates and origin/destination
• Amendments and corrections, each with the reason noted

For removed or closed registers (joseki-tohon), the document also shows the date and reason the page was closed — for example, because all members were transferred out, or because the register was consolidated during a national reform.

Common Overseas Uses

The koseki-tohon is the primary document Japanese nationals and their descendants need for a wide range of official purposes abroad.

Citizenship by descent (Jure Sanguinis)

Countries including Italy, Argentina, and Brazil recognize citizenship through uninterrupted lineage. Applicants must submit a chain of koseki-tohon and joseki-tohon spanning each generation, translated and apostilled, to prove an unbroken line of Japanese ancestry. This is one of the most common reasons overseas clients contact us.

Marriage registration abroad

Most foreign registrars require a Japanese national to produce their koseki-tohon — certified translated and apostilled — as proof of current marital status and parentage. The document confirms that the person is not already married in Japan and records the parents' names as required for foreign marriage certificates.

Visa and immigration applications

Australian, US, Canadian, and European immigration authorities may require a koseki-tohon as proof of family relationships — for example, when sponsoring a parent or proving a dependent relationship. The document is often required alongside a certified English translation.

Inheritance and probate

When a Japanese national passes away and leaves assets in Japan, the koseki-tohon is required to establish the legal heirs. Foreign-based heirs often need multiple generations of registers to demonstrate their entitlement under Japanese succession law.

Genealogy and ancestry research

For Japanese diaspora communities — particularly in Brazil, the United States, Hawaii, and Peru — the koseki-tohon is the authoritative source for tracing family history back to Japan.

Who Can Request a Koseki-Tohon

Under the Japanese Koseki Law (Article 10), a koseki-tohon may be requested by:

• The person registered on the koseki
• Their spouse
• Direct ascendants: parents, grandparents
• Direct descendants: children, grandchildren
• A person holding a valid power of attorney (inin-jo) from one of the above

The power of attorney must be signed by the eligible requester. In most cases, it does not need to be notarized — a personal signature is sufficient, though some municipalities may request additional identification documentation. We provide a clear, plain-language POA form and explain exactly what you are signing before you return it.

How to Obtain a Koseki-Tohon from Outside Japan

Requesting a koseki-tohon from abroad is straightforward when you have the right representative. The process with Japan Document Service works as follows:

1. Free assessment — Tell us your situation: what you need the document for, your honseki if known, and your timeline. We confirm which records are required and send you a flat-fee quote within one business day.
2. Sign the power of attorney — We send you a simple POA form. You sign it and return it by email (a scanned or photographed copy is accepted in most cases). No visit to a notary or consulate is usually required.
3. We submit the request — Our representative contacts the relevant municipal office and submits the request with the POA and any supporting documentation required by that office.
4. Translation and apostille (if required) — Once the original document is in hand, our certified translator prepares the English translation. If an apostille is needed, we submit the document to the Ministry of Foreign Affairs on your behalf.
5. International delivery — The complete document set — originals, certified translation, and apostille where applicable — is couriered to your address worldwide.

If you do not know your honseki, contact us with whatever information you have — a childhood address, a parent's name, an old Japanese passport. We can often identify the correct municipality from partial information before submitting the request.

Frequently Asked Questions

Common questions about koseki-tohon requests from overseas.