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Japan citizenship by descent is governed by Nationality by birth & notification. Japanese citizenship by descent is available to children of Japanese nationals born abroad, subject to notification within tight windows. We recover koseki (family registry) records from the relevant ward office and handle the notification process.
This pillar page clusters every piece of Ancestra content related to Japann citizenship by descent — country guide, document checklists, comparisons, glossary terms, cost estimates, and eligibility assessment — in one place.
The key thing to know: The 3-month notification rule is critical: if a child born abroad to a Japanese parent is not registered within 3 months, they may lose Japanese nationality. The koseki (family registry) is the foundational document.
Transmission rule: Both parents equally since 1985. Before 1985, paternal only.
Generational limit: 1 generation (parent). Children of Japanese nationals born abroad are Japanese if registered within 3 months. Second-generation must have continuously maintained Japanese nationality.
Dual citizenship: Not permitted — Japan strictly requires citizens to choose one nationality by age 22 (if dual from birth). Naturalized citizens must renounce.
Language requirement: None for descent path.
Filing authority: Japanese consulate (koseki registration) or ward office in Japan.
FAQ
Is there a generational limit for Japan citizenship by descent?
Japan: 1 generation (parent). Children of Japanese nationals born abroad are Japanese if registered within 3 months. Second-generation must have continuously maintained Japanese nationality.
Does Japan allow dual citizenship?
Japan: Not permitted — Japan strictly requires citizens to choose one nationality by age 22 (if dual from birth). Naturalized citizens must renounce.
Related resources
Japan country guide
Nationality by birth & notification
Japan checklist (grandparent)
Complete document checklist for claiming through a grandparent
Japan checklist (parent)
Complete document checklist for claiming through a parent
Japan cost calculator
Estimate your all-in cost
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