Supplementary Provisions, Article 2Transitional Measures Concerning Age of Majority
第二条（成年に関する経過措置）
The provisions of Article 4 of the Civil Code as amended by this Act (referred to as the "New Act" below) apply to a person who attains the age of 18 on or after the day of enforcement of this Act (referred to as the "Effective Date" below), and with regard to the time at which a person aged 20 or more at the time of the enforcement of this Act attained the age of majority, the provisions then in force continue to govern.
この法律による改正後の民法（以下「新法」という。）第四条の規定は、この法律の施行の日（以下「施行日」という。）以後に十八歳に達する者について適用し、この法律の施行の際に二十歳以上の者の成年に達した時については、なお従前の例による。
A person aged 18 or more and less than 20 at the time of the enforcement of this Act (excluding a person prescribed in the following paragraph) is to attain the age of majority on the Effective Date.
With regard to a person who married before the Effective Date and was deemed to have attained the age of majority pursuant to the provisions of Article 753 of the Civil Code before amendment by this Act (referred to as the "Former Act" in paragraph (3) of the following Article), the person continues, after the enforcement of this Act as well, to be deemed to have attained the age of majority at the time of that marriage, in accordance with the provisions then in force.