If a person acquires Japanese nationality pursuant to the provisions of Article 3, paragraph (1) or Article 17, paragraph (1) or (2) of the Nationality Act (Act No. 147 of 1950), the person acquiring Japanese nationality must submit a notification of acquisition of Japanese nationality within one month from the date of that acquisition (or if the person was abroad on that date, within three months).
国籍法（昭和二十五年法律第百四十七号）第三条第一項又は第十七条第一項若しくは第二項の規定によつて国籍を取得した場合の国籍取得の届出は、国籍を取得した者が、その取得の日から一箇月以内（その者がその日に国外に在るときは、三箇月以内）に、これをしなければならない。
The written notification must state the following particulars, and be accompanied by a document certifying the acquisition of Japanese nationality:
届書には、次の事項を記載し、国籍取得を証すべき書面を添付しなければならない。
the date of acquisition of Japanese nationality;
国籍取得の年月日
the foreign nationality that the person had at the time of their acquisition of Japanese nationality;
国籍取得の際に有していた外国の国籍
the names and registered domiciles of their parents, or if the mother or father is a foreign national, their name and nationality;
父母の氏名及び本籍、父又は母が外国人であるときは、その氏名及び国籍
the name and registered domicile of any spouse, or if their spouse is a foreign national, their name and nationality; and
配偶者の氏名及び本籍、配偶者が外国人であるときは、その氏名及び国籍
other particulars specified by Ministry of Justice Order.
その他法務省令で定める事項