日本国籍の両親を持つ子がアメリカで生まれた場合、二重国籍となる？
Under the revisions made to the Nationality Law in 1985, Articles 14 and 15 require any person who holds multiple citizenship to make a "declaration of choice" between the ages of 20 and 22, in which they choose to renounce either their Japanese nationality or their foreign citizenship(s). Failure to do so entitles the Minister of Justice to demand a declaration of choice at any time. If the required declaration is not made within one month, their Japanese nationality is automatically revoked. A renunciation of foreign citizenship made before Japanese officials may be considered by a foreign state as having no legal effect as is the case with, for example, United States citizenship.
no