# 民法 / Civil Code — 第七百七十八条の二 (Article 778-2)

- Law: 民法 (Civil Code), 明治二十九年法律第八十九号
- English title "Civil Code": Ministry of Justice translation
- Kind: Act — the distinction between 法律 (Act), 政令 (Cabinet Order), 省令 (Ministerial Order) and 条例 (local ordinance) decides who may issue it and what it may say.
- Provision: 第七百七十八条の二 (Article 778-2) — address `art-778-2`
- Text in force since: 2026-06-24
- URL (the page that opens at this provision): https://japanlaw.org/ja/civil-code/art-778-2
- Permanent URL (e-Gov law ID, never renamed): https://japanlaw.org/l/129AC0000000089/art-778-2
- Every provision below carries its address and both URLs on the line under it.
- Japanese text: e-Gov 法令検索, Digital Agency (デジタル庁). English: as marked on each line below.

Only the Japanese as published by the government has legal effect; the text
below is a copy of it. Every English rendering below is a translation and
says which kind: the Ministry of Justice's translation, or this
site's machine translation, whose model and date the Sources list names.
They are never merged and never substituted for one another.

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### 第七百七十八条の二
<sup>art-778-2 · https://japanlaw.org/ja/civil-code/art-778-2 · https://japanlaw.org/l/129AC0000000089/art-778-2</sup>

    **第一項**  第七百七十七条（第二号に係る部分に限る。）又は前条（第二号に係る部分に限る。）の期間の満了前六箇月以内の間に親権を行う母、親権を行う養親及び未成年後見人がないときは、子は、母若しくは養親の親権停止の期間が満了し、親権喪失若しくは親権停止の審判の取消しの審判が確定し、若しくは親権が回復された時、新たに養子縁組が成立した時又は未成年後見人が就職した時から六箇月を経過するまでの間は、嫡出否認の訴えを提起することができる。
    <sup>art-778-2/par-1 · https://japanlaw.org/ja/civil-code/art-778-2/par-1 · https://japanlaw.org/l/129AC0000000089/art-778-2/par-1</sup>
    If, during the six months before the expiration of the period under Article 777 (limited to the part pertaining to item (ii)) or the preceding Article (limited to the part pertaining to item (ii)), there is no mother exercising parental authority, adoptive parent exercising parental authority, or guardian of a minor, the child may file an action to rebut the presumption of the child in wedlock until six months have passed from the time when the period of suspension of parental authority of the mother or adoptive parent expires, a ruling rescinding a ruling affirming the loss of parental authority or a ruling to suspend parental authority becomes final and binding, or parental authority is restored, the time when a new adoption is formed, or the time when a guardian of a minor takes office.
    <sup>machine translation, not official</sup>

    **第二項**  子は、その父と継続して同居した期間（当該期間が二以上あるときは、そのうち最も長い期間）が三年を下回るときは、第七百七十七条（第二号に係る部分に限る。）及び前条（第二号に係る部分に限る。）の規定にかかわらず、二十一歳に達するまでの間、嫡出否認の訴えを提起することができる。ただし、子の否認権の行使が父による養育の状況に照らして父の利益を著しく害するときは、この限りでない。
    <sup>art-778-2/par-2 · https://japanlaw.org/ja/civil-code/art-778-2/par-2 · https://japanlaw.org/l/129AC0000000089/art-778-2/par-2</sup>
    If the period during which the child has continuously lived with the father (or, if there are two or more such periods, the longest of them) is less than three years, the child may, notwithstanding the provisions of Article 777 (limited to the part pertaining to item (ii)) and the preceding Article (limited to the part pertaining to item (ii)), file an action to rebut the presumption of the child in wedlock until the child reaches the age of 21; provided, however, that this does not apply if the exercise of the child's right to rebut the presumption would significantly harm the interests of the father in light of the circumstances of upbringing by the father.
    <sup>machine translation, not official</sup>

    **第三項**  第七百七十四条第二項の規定は、前項の場合には、適用しない。
    <sup>art-778-2/par-3 · https://japanlaw.org/ja/civil-code/art-778-2/par-3 · https://japanlaw.org/l/129AC0000000089/art-778-2/par-3</sup>
    The provisions of Article 774, paragraph (2) do not apply in the case referred to in the preceding paragraph.
    <sup>machine translation, not official</sup>

    **第四項**  第七百七十七条（第四号に係る部分に限る。）及び前条（第四号に係る部分に限る。）に掲げる否認権の行使に係る嫡出否認の訴えは、子が成年に達した後は、提起することができない。
    <sup>art-778-2/par-4 · https://japanlaw.org/ja/civil-code/art-778-2/par-4 · https://japanlaw.org/l/129AC0000000089/art-778-2/par-4</sup>
    An action to rebut the presumption of the child in wedlock pertaining to the exercise of the right to rebut the presumption set forth in Article 777 (limited to the part pertaining to item (iv)) and the preceding Article (limited to the part pertaining to item (iv)) may not be filed after the child has attained the age of majority.
    <sup>machine translation, not official</sup>

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## Cites
- art-778-2/par-1: 第七百七十七条 → 民法 第七百七十七条 (Article 777), art-777 — https://japanlaw.org/ja/civil-code/art-777 · https://japanlaw.org/l/129AC0000000089/art-777
- art-778-2/par-1: 第二号 → 民法 第七百七十七条第一項第二号 (Article 777, paragraph (1), item (ii)), art-777/par-1/item-2 — https://japanlaw.org/ja/civil-code/art-777/par-1/item-2 · https://japanlaw.org/l/129AC0000000089/art-777/par-1/item-2
- art-778-2/par-1: 前条 → 民法 第七百七十八条 (Article 778), art-778 — https://japanlaw.org/ja/civil-code/art-778 · https://japanlaw.org/l/129AC0000000089/art-778
- art-778-2/par-1: 第二号 → 民法 第七百七十八条第一項第二号 (Article 778, paragraph (1), item (ii)), art-778/par-1/item-2 — https://japanlaw.org/ja/civil-code/art-778/par-1/item-2 · https://japanlaw.org/l/129AC0000000089/art-778/par-1/item-2
- art-778-2/par-2: 第七百七十七条 → 民法 第七百七十七条 (Article 777), art-777 — https://japanlaw.org/ja/civil-code/art-777 · https://japanlaw.org/l/129AC0000000089/art-777
- art-778-2/par-2: 第二号 → 民法 第七百七十七条第一項第二号 (Article 777, paragraph (1), item (ii)), art-777/par-1/item-2 — https://japanlaw.org/ja/civil-code/art-777/par-1/item-2 · https://japanlaw.org/l/129AC0000000089/art-777/par-1/item-2
- art-778-2/par-2: 前条 → 民法 第七百七十八条 (Article 778), art-778 — https://japanlaw.org/ja/civil-code/art-778 · https://japanlaw.org/l/129AC0000000089/art-778
- art-778-2/par-2: 第二号 → 民法 第七百七十八条第一項第二号 (Article 778, paragraph (1), item (ii)), art-778/par-1/item-2 — https://japanlaw.org/ja/civil-code/art-778/par-1/item-2 · https://japanlaw.org/l/129AC0000000089/art-778/par-1/item-2
- art-778-2/par-3: 第七百七十四条第二項 → 民法 第七百七十四条第二項 (Article 774, paragraph (2)), art-774/par-2 — https://japanlaw.org/ja/civil-code/art-774/par-2 · https://japanlaw.org/l/129AC0000000089/art-774/par-2
- art-778-2/par-3: 前項 → 民法 第七百七十八条の二第二項 (Article 778-2, paragraph (2)), art-778-2/par-2 — https://japanlaw.org/ja/civil-code/art-778-2/par-2 · https://japanlaw.org/l/129AC0000000089/art-778-2/par-2
- art-778-2/par-4: 第七百七十七条 → 民法 第七百七十七条 (Article 777), art-777 — https://japanlaw.org/ja/civil-code/art-777 · https://japanlaw.org/l/129AC0000000089/art-777
- art-778-2/par-4: 第四号 → 民法 第七百七十七条第一項第四号 (Article 777, paragraph (1), item (iv)), art-777/par-1/item-4 — https://japanlaw.org/ja/civil-code/art-777/par-1/item-4 · https://japanlaw.org/l/129AC0000000089/art-777/par-1/item-4
- art-778-2/par-4: 前条 → 民法 第七百七十八条 (Article 778), art-778 — https://japanlaw.org/ja/civil-code/art-778 · https://japanlaw.org/l/129AC0000000089/art-778
- art-778-2/par-4: 第四号 → 民法 第七百七十八条第一項第四号 (Article 778, paragraph (1), item (iv)), art-778/par-1/item-4 — https://japanlaw.org/ja/civil-code/art-778/par-1/item-4 · https://japanlaw.org/l/129AC0000000089/art-778/par-1/item-4

## Cited by

3 provisions cite this one. No official source publishes this direction.

- 民法 第七百七十八条の二第三項 — https://japanlaw.org/ja/civil-code/art-778-2/par-3 · https://japanlaw.org/l/129AC0000000089/art-778-2/par-3
- 民法 附則第四条第二項（嫡出の否認及び嫡出の承認に関する経過措置） — https://japanlaw.org/ja/civil-code/suppl-5041-102/art-4/par-2 · https://japanlaw.org/l/129AC0000000089/suppl-5041-102/art-4/par-2
- 民法 附則第四条第三項（嫡出の否認及び嫡出の承認に関する経過措置） — https://japanlaw.org/ja/civil-code/suppl-5041-102/art-4/par-3 · https://japanlaw.org/l/129AC0000000089/suppl-5041-102/art-4/par-3

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## Sources

- e-Gov 法令検索, Digital Agency (デジタル庁) — 民法 — the text in force from 2026-06-24 (https://laws.e-gov.go.jp/law/129AC0000000089/20260624_508AC0000000045), retrieved 2026-10-11
- Japanese Law Translation Database System, Ministry of Justice (法務省) — Civil Code — Ministry of Justice translation (part 1 of 2) (https://www.japaneselawtranslation.go.jp/en/laws/view/4848/tb), retrieved 2026-10-11
- claude-sonnet-5-5 — Machine translation, batch civil-code-20261011T170941-003, translated 2026-10-12
- This site's parser, version 190 — 民法 — structure, counts, cross-references and defined terms, computed 2026-10-11