国籍
こくせき
kokuseki
= nationality; citizenship; national status
Kokuseki (国籍) is the word you’ll encounter on every Japanese government form, visa application, and registration document. It means ‘nationality’ — the legal tie between a person and a country — and knowing it is essential for navigating life in Japan as a foreigner.
Kokuseki (国籍) refers to the formal legal status of belonging to a particular nation-state. In Japanese bureaucracy, kokuseki appears on residence cards (zairyu card), tax forms, and hospital registration papers. The question Kokuseki wa doko desu ka? (国籍はどこですか？) means ‘What is your nationality?’ and is a standard form-filling question rather than a personal inquiry. Japan currently does not formally recognize dual nationality for adults, so kokuseki is a singular, legally defined status for Japanese citizens. Related vocabulary includes kokuseki shuutoku (国籍取得, acquiring nationality/naturalization) and kokuseki haki (国籍離脱, renouncing nationality).
Don’t confuse kokuseki with shimin-ken (市民権, civil rights or civil status) or imin (移民, immigrant/immigration). In everyday speech, people often say doko no kuni no hito? (どこの国の人？, ‘What country are you from?’) rather than formally asking about kokuseki. On forms, the answer should be the official name of your country of citizenship, not your country of birth or residence.
国籍 is made up of 国 (koku/kuni — country, nation) and 籍 (seki — register, record, membership). The character 籍 originally referred to bamboo strips used for official records, reflecting the historical idea that nationality is fundamentally about being registered in a nation’s official documents.
Everyday use
申込書に国籍を記入してください。
Moushikomisho ni kokuseki wo kinyuu shite kudasai.
Please fill in your nationality on the application form.
Casual / Social Media
彼女はアメリカ国籍を持っているが、日本で育った。
Kanojo wa Amerika kokuseki wo motte iru ga, Nihon de sodatta.
She holds American nationality but grew up in Japan.
Formal / Cultural context
国籍と出身地は必ずしも同じではない。
Kokuseki to shusshinchi wa kanarazu shimo onaji de wa nai.
Nationality and place of origin are not necessarily the same thing.
Japan’s kokuseki law is governed by the Nationality Act (Kokuseki-hō), which follows the principle of jus sanguinis (right of blood) rather than jus soli (right of soil). This means Japanese nationality is passed through parentage, not birth location — a child born in Japan to non-Japanese parents does not automatically become Japanese. This legal framework shapes Japan’s approach to immigration and national identity in ways that visitors and long-term residents frequently encounter.
For foreigners living in Japan, kokuseki appears constantly in administrative life. Registering at a city hall (yakusho), opening a bank account, enrolling a child in school, or applying for a mobile phone contract will all require stating your kokuseki. It also affects which line you stand in at immigration — Nihon kokuseki (日本国籍, Japanese nationality) versus gaikoku kokuseki (外国国籍, foreign nationality).
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