Supplementary Provisions, Article 3Transitional Measures Concerning the Division of the Estate
第三条（遺産の分割に関する経過措置）
The provisions of Article 904-3 and Article 908, paragraphs (2) through (5) of the New Civil Code also apply to the division of an estate for which succession commenced before the Effective Date. In this case, the phrase "before ten years have elapsed from the time the succession opened" in item (i) of Article 904-3 of the New Civil Code is deemed to be replaced with "until the later of the time when ten years have elapsed from the time the succession opened and the time when five years have elapsed from the time of enforcement of the Act Partially Amending the Civil Code, etc. (Act No. 24 of 2021)", the phrase "the ten-year period" in item (ii) of that Article is deemed to be replaced with "the ten-year period (in the case where the five-year period starting from the time of enforcement of the Act Partially Amending the Civil Code, etc. expires after the expiration of the ten-year period starting from the time the succession opened, the five-year period starting from the time of enforcement of that Act)", and the phrase "ten years from the time the succession opened" in the proviso to Article 908, paragraph (2), the proviso to paragraph (3), the proviso to paragraph (4), and the proviso to paragraph (5) of the New Civil Code is deemed to be replaced with "the later of the time when ten years have elapsed from the time the succession opened and the time when five years have elapsed from the time of enforcement of the Act Partially Amending the Civil Code, etc.".
新民法第九百四条の三及び第九百八条第二項から第五項までの規定は、施行日前に相続が開始した遺産の分割についても、適用する。この場合において、新民法第九百四条の三第一号中「相続開始の時から十年を経過する前」とあるのは「相続開始の時から十年を経過する時又は民法等の一部を改正する法律（令和三年法律第二十四号）の施行の時から五年を経過する時のいずれか遅い時まで」と、同条第二号中「十年の期間」とあるのは「十年の期間（相続開始の時から始まる十年の期間の満了後に民法等の一部を改正する法律の施行の時から始まる五年の期間が満了する場合にあっては、同法の施行の時から始まる五年の期間）」と、新民法第九百八条第二項ただし書、第三項ただし書、第四項ただし書及び第五項ただし書中「相続開始の時から十年」とあるのは「相続開始の時から十年を経過する時又は民法等の一部を改正する法律の施行の時から五年を経過する時のいずれか遅い時」とする。