Waiver of inheritance rights - Iryubun no broom

...In addition, the right to claim for reduction is subject to a one-year statute of limitations and will expire ten years after the start of the inheritance (Article 1042).
[Waiver of inheritance rights]
A person entitled to a reserved portion may renounce all or part of the reserved portion that will belong to him or her in the future before the start of the inheritance. A person entitled to a reserved portion is free to renounce his or her reserved portion after the start of the inheritance, and therefore does not need permission from the family court to do so.

*Some of the terminology used to refer to "waiver of inheritance rights" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…なお，減殺請求権は1年の消滅時効にかかり，また相続開始後10年を経過すれば消滅する(1042条)。
［遺留分の放棄］
　遺留分権利者は，相続開始前に，将来自己に帰属すべき遺留分の全部または一部を放棄することができる。相続開始後に遺留分を放棄することは，遺留分権利者の自由であり，したがってそのために家庭裁判所の許可は必要ではない。…

※「遺留分の放棄」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報