In a court case in which it was disputed whether the provision of the Nationality Law, which prohibits the Japan of nationality and dual citizenship is unconstitutional, if a person acquires foreign nationality of his own volition, is unconstitutional, the Supreme Court decided to reject the plaintiffs' appeal by February 2, and the judgment that "it does not violate the Constitution" was confirmed.
The Japan Nationality Law stipulates that if you acquire a foreign nationality of your own wish, you will lose your Japan nationality and does not allow dual citizenship.
Eight people, including those who lived in Switzerland and Liechtenstein and acquired local nationality and lost their Japan nationality, argued that "the provision of the law that deprives people of their nationality against their will violates the Constitution that stipulates respect for the individual and is invalid," and demanded confirmation of their Japan nationality and compensation.
In February, the Tokyo High Court in the second instance stated, "Granting multiple nationalities may lead to friction between countries over which country protects individuals, and conflicts may arise in terms of obligations such as tax payment and military service. Following the first trial, we judged that it was not a violation of the Constitution and dismissed the appeal.
The plaintiffs had appealed, but Judge Masaaki Oka of the First Small Chamber of the Supreme Court decided to dismiss the appeal by the 8nd, and the judgment that the provisions of the Nationality Law "do not violate the Constitution" was confirmed.