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

- 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 (Article 778) — address `art-778`
- Text in force since: 2026-06-24
- URL (the page that opens at this provision): https://japanlaw.org/ja/civil-code/art-778
- Permanent URL (e-Gov law ID, never renamed): https://japanlaw.org/l/129AC0000000089/art-778
- 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
<sup>art-778 · https://japanlaw.org/ja/civil-code/art-778 · https://japanlaw.org/l/129AC0000000089/art-778</sup>

    **第一項**  第七百七十二条第三項の規定により父が定められた子について第七百七十四条の規定により嫡出であることが否認されたときは、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、前条の規定にかかわらず、それぞれ当該各号に定める時から一年以内に提起しなければならない。
    <sup>art-778/par-1 · https://japanlaw.org/ja/civil-code/art-778/par-1 · https://japanlaw.org/l/129AC0000000089/art-778/par-1</sup>
    If, with respect to a child whose father was determined pursuant to the provisions of Article 772, paragraph (3), the presumption that the child is the father's child in wedlock has been rebutted pursuant to the provisions of Article 774, 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, notwithstanding the provisions of the preceding Article, be filed within one year from the time specified respectively in those items.
    <sup>machine translation, not official</sup>

      **一**  第七百七十二条第四項の規定により読み替えられた同条第三項の規定により新たに子の父と定められた者の否認権　新たに子の父と定められた者が当該子に係る嫡出否認の裁判が確定したことを知った時
      <sup>art-778/par-1/item-1 · https://japanlaw.org/ja/civil-code/art-778/par-1/item-1 · https://japanlaw.org/l/129AC0000000089/art-778/par-1/item-1</sup>
      the right to rebut the presumption of a person newly determined to be the father of the child pursuant to the provisions of Article 772, paragraph (3) as replaced pursuant to the provisions of paragraph (4) of that Article: the time when the person newly determined to be the father of the child learns that the judgment to rebut the presumption of the child in wedlock concerning that child has become final and binding;
      <sup>machine translation, not official</sup>

      **二**  子の否認権　子が前号の裁判が確定したことを知った時
      <sup>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</sup>
      the child's right to rebut the presumption: the time when the child learns that the judgment referred to in the preceding item has become final and binding;
      <sup>machine translation, not official</sup>

      **三**  母の否認権　母が第一号の裁判が確定したことを知った時
      <sup>art-778/par-1/item-3 · https://japanlaw.org/ja/civil-code/art-778/par-1/item-3 · https://japanlaw.org/l/129AC0000000089/art-778/par-1/item-3</sup>
      the mother's right to rebut the presumption: the time when the mother learns that the judgment referred to in item (i) has become final and binding;
      <sup>machine translation, not official</sup>

      **四**  前夫の否認権　前夫が第一号の裁判が確定したことを知った時
      <sup>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</sup>
      the former husband's right to rebut the presumption: the time when the former husband learns that the judgment referred to in item (i) has become final and binding.
      <sup>machine translation, not official</sup>

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## Cites
- art-778/par-1: 第七百七十二条第三項 → 民法 第七百七十二条第三項 (Article 772, paragraph (3)), art-772/par-3 — https://japanlaw.org/ja/civil-code/art-772/par-3 · https://japanlaw.org/l/129AC0000000089/art-772/par-3
- art-778/par-1: 第七百七十四条 → 民法 第七百七十四条 (Article 774), art-774 — https://japanlaw.org/ja/civil-code/art-774 · https://japanlaw.org/l/129AC0000000089/art-774
- art-778/par-1: 前条 → 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/par-1/item-1: 第七百七十二条第四項 → 民法 第七百七十二条第四項 (Article 772, paragraph (4)), art-772/par-4 — https://japanlaw.org/ja/civil-code/art-772/par-4 · https://japanlaw.org/l/129AC0000000089/art-772/par-4
- art-778/par-1/item-1: 同条第三項 → 民法 第七百七十二条第三項 (Article 772, paragraph (3)), art-772/par-3 — https://japanlaw.org/ja/civil-code/art-772/par-3 · https://japanlaw.org/l/129AC0000000089/art-772/par-3
- art-778/par-1/item-2: 前号 → 民法 第七百七十八条第一項第一号 (Article 778, paragraph (1), item (i)), art-778/par-1/item-1 — https://japanlaw.org/ja/civil-code/art-778/par-1/item-1 · https://japanlaw.org/l/129AC0000000089/art-778/par-1/item-1
- art-778/par-1/item-3: 第一号 → 民法 第七百七十八条第一項第一号 (Article 778, paragraph (1), item (i)), art-778/par-1/item-1 — https://japanlaw.org/ja/civil-code/art-778/par-1/item-1 · https://japanlaw.org/l/129AC0000000089/art-778/par-1/item-1
- art-778/par-1/item-4: 第一号 → 民法 第七百七十八条第一項第一号 (Article 778, paragraph (1), item (i)), art-778/par-1/item-1 — https://japanlaw.org/ja/civil-code/art-778/par-1/item-1 · https://japanlaw.org/l/129AC0000000089/art-778/par-1/item-1

## Cited by

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

- 民法 第七百七十八条第一項第二号 — https://japanlaw.org/ja/civil-code/art-778/par-1/item-2 · https://japanlaw.org/l/129AC0000000089/art-778/par-1/item-2
- 民法 第七百七十八条第一項第三号 — https://japanlaw.org/ja/civil-code/art-778/par-1/item-3 · https://japanlaw.org/l/129AC0000000089/art-778/par-1/item-3
- 民法 第七百七十八条第一項第四号 — https://japanlaw.org/ja/civil-code/art-778/par-1/item-4 · https://japanlaw.org/l/129AC0000000089/art-778/par-1/item-4
- 民法 第七百七十八条の二第一項 — https://japanlaw.org/ja/civil-code/art-778-2/par-1 · https://japanlaw.org/l/129AC0000000089/art-778-2/par-1
- 民法 第七百七十八条の二第二項 — https://japanlaw.org/ja/civil-code/art-778-2/par-2 · https://japanlaw.org/l/129AC0000000089/art-778-2/par-2
- 民法 第七百七十八条の二第四項 — https://japanlaw.org/ja/civil-code/art-778-2/par-4 · https://japanlaw.org/l/129AC0000000089/art-778-2/par-4
- 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
- claude-sonnet-5-5 — Machine translation, batch civil-code-20261011T211255-001, translated 2026-10-12
- This site's parser, version 190 — 民法 — structure, counts, cross-references and defined terms, computed 2026-10-11