Article 777Statute of Limitations for Filing an Action to Rebut the Presumption of Child in Wedlock
第七百七十七条（嫡出否認の訴えの出訴期間）
An action to rebut the presumption of the child in wedlock pertaining to the exercise of a right to rebut the presumption set forth in each of the following items must be filed within three years from the time specified respectively in those items.
次の各号に掲げる否認権の行使に係る嫡出否認の訴えは、それぞれ当該各号に定める時から三年以内に提起しなければならない。
the father's right to rebut the presumption: the time when the father learns of the child's birth;
父の否認権 父が子の出生を知った時
the child's right to rebut the presumption: the time of the child's birth;
子の否認権 その出生の時
the mother's right to rebut the presumption: the time of the child's birth;
母の否認権 子の出生の時
the former husband's right to rebut the presumption: the time when the former husband learns of the child's birth.
前夫の否認権 前夫が子の出生を知った時