Nikkei Sansei Visa: Koseki Search and Documents for Moving to Japan

Was one of your grandparents Japanese, but you do not know where their family register is? Are you considering moving to Japan with your family and unsure where to begin?

Start with the family information and records you already have. You do not need a complete set of koseki records before making an initial inquiry. However, Japanese ancestry alone does not establish eligibility or guarantee approval. Record research, an assessment of the available evidence, and an immigration application are separate stages. This guide focuses on preparation for a Certificate of Eligibility (COE) application from overseas as a third-generation Japanese descendant.

1. Identify the family line and nationality timeline

Make a simple note connecting your grandparent, parent and yourself. Record names, former surnames, dates and places of birth, marriages and foreign citizenship events where known. Mark uncertain information as unknown rather than filling gaps with guesses.

The label “Nikkei Sansei” does not, by itself, determine the correct immigration category. The review should consider who held Japanese nationality, when they held it, and how nationality events relate to births in the next generation. If an applicant may already hold Japanese nationality, that issue also needs to be clarified.

2. What if you cannot locate the koseki?

Look for older family-register copies, passports, birth records and marriage records held by relatives. A former surname, Japanese name, old address or remembered municipality may provide a useful lead.

A birthplace or former home address is not necessarily the registered domicile, known as honseki. Do not invent kanji or assume an address is the honseki. Keep family recollections separate from facts recorded in documents and points still requiring verification.

Research also requires an appropriate basis for requesting records, any necessary authorization, and identification of the relevant municipality. A search cannot guarantee that records will be found. If a record cannot be obtained, the reason and the remaining evidence must be reviewed before deciding the next step.

3. Connect each generation with evidence

A family tree helps explain the relationship, but it does not replace official certificates. Identify which record supports each link from the grandparent to the parent and from the parent to the applicant.

• Japanese records may include the grandparent’s koseki or removed family register, and certificates relating to events registered in Japan.
• Foreign records may include birth certificates for the parent and applicant, and marriage certificates for the grandparents and parents.
• Individual circumstances may require records relating to name changes, parentage acknowledgment, adoption, death or acquisition of foreign citizenship.

Check former surnames, married names, middle names and spelling variations. Preserve the wording of each record and explain the evidence connecting different names to the same person. Foreign-language documents submitted to Immigration require Japanese translations.

4. Prepare for life in Japan as well as proving ancestry

The Immigration Services Agency’s Nikkei Sansei COE guidance lists application documents, evidence of occupation or financial support, a letter of guarantee and the applicant’s criminal-record certificate, among other items. The financial documents depend on whether the applicant supports themselves or has a financial supporter in Japan.

The guarantor is normally a Japanese national or permanent resident living in Japan. Having an acquaintance in Japan does not automatically mean that person can serve as the guarantor.

The official guidance requires certificates issued in Japan to have been issued within three months of submission. Distinguish an older copy used for research from a certificate intended for the application.

Applicants requesting a five-year period of stay are asked to submit specified evidence of Japanese-language ability, with an exception for minors. This should not be presented as one universal language-test requirement for every Nikkei Sansei application.

Before ordering certificates, confirm the issuing authority and format appropriate to your circumstances. Applications to change or renew a status use different document lists.

5. Planning to move with a spouse or children?

Family members do not automatically receive the same status as the principal applicant. Each person’s nationality, age, marriage or parent-child relationship, dependency and proposed living arrangements need to be considered.

Tell us about accompanying family members and your preferred relocation date from the start. Eligibility for the whole family and simultaneous entry cannot be confirmed before reviewing the relevant circumstances and evidence.

For spouse and child residence routes, a child’s age at entry, and the order of preparation, read our guide to moving to Japan as a Nikkei Sansei family.

6. Separate record research from application support

After reviewing your inquiry and available information, Tommy’s Legal Service can explain the scope of assistance we may be able to provide. Work may be organized into stages:

1. Identifying leads, researching and assisting with Japanese family records.
2. Comparing Japanese and foreign records and reviewing the family line and potential immigration route.
3. Preparing and assisting with a COE application after the engagement scope and requirements are confirmed.

A koseki research engagement does not automatically include a COE application, foreign record retrieval or every translation. The quotation should identify the research scope, deliverables, expenses and treatment of additional work. Neither finding a record nor obtaining immigration approval can be guaranteed.

7. What to tell us in your initial inquiry

• Your nationality, current country of residence and preferred language.
• Which relative was Japanese and how you are related.
• Known names, former names, places of birth and honseki information.
• The records you already hold and those you cannot locate.
• Accompanying family members and your preferred relocation timing.
• Whether you want record research, application assistance or both.

It is fine to say that something is unknown. Begin with a summary. The free initial check covers whether we may handle the matter, the general procedural direction and information needed for a quotation. A final eligibility assessment, detailed research or written opinion may require a separately agreed paid service.

View fees and consultation conditions

Official references: Immigration Services Agency guidance for Nikkei Sansei and COE document checklist.

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