A right to receive payment of a retirement allowance, etc. is extinguished by prescription if it is not exercised for five years from the time when it becomes exercisable, and a right to receive payment of premiums and past service premiums and a right to receive a refund of premiums or past service premiums are extinguished by prescription if they are not exercised for two years from the time when they become exercisable.
退職金等の支給を受ける権利はこれらを行使することができる時から五年間、掛金及び過去勤務掛金の納付を受ける権利並びに掛金又は過去勤務掛金の返還を受ける権利はこれらを行使することができる時から二年間行使しないときは、時効によつて消滅する。
In the case where a bereaved family member who has the right to receive payment of a retirement allowance is unable to claim the retirement allowance because it is unknown whether a person of a prior or equal rank is alive or where that person is, the extinctive prescription of that right is not to be completed within six months from the day on which the claim becomes possible.
退職金の支給を受ける権利を有する遺族が先順位者又は同順位者の生死又は所在が不明であるために退職金の請求をすることができない場合には、その請求をすることができることとなつた日から六月以内は、当該権利の消滅時効は、完成しないものとする。
Read this with the articles around it
retirement allowance, etc.machine translation
「退職金等」
A retirement allowance (退職金) or a cancellation refund (解約手当金).
Short name set inArticle 8, paragraph (2), item (iii)