# 民法 / Civil Code — 第十二条 (Supplementary Provisions, Article 12)
- 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: 第十二条 (Supplementary Provisions, Article 12) — address `suppl-3221-222/art-12`
- Text in force since: 2026-06-24
- URL (the page that opens at this provision): https://japanlaw.org/en/civil-code/suppl-3221-222/art-12
- Permanent URL (e-Gov law ID, never renamed): https://japanlaw.org/l/129AC0000000089/suppl-3221-222/art-12
- 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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### 第十二条
suppl-3221-222/art-12 · https://japanlaw.org/en/civil-code/suppl-3221-222/art-12 · https://japanlaw.org/l/129AC0000000089/suppl-3221-222/art-12
**第一項** 応急措置法施行前に未成年の子が旧法第七百三十七条又は第七百三十八条の規定によつて父又は母の家に入つた場合には、その子は、成年に達した時から一年以内に従前の氏に復することができる。その子が新法施行前に成年に達した場合において、新法施行後一年以内も、同様である。
suppl-3221-222/art-12/par-1 · https://japanlaw.org/en/civil-code/suppl-3221-222/art-12/par-1 · https://japanlaw.org/l/129AC0000000089/suppl-3221-222/art-12/par-1
If, before the Emergency Measures Act came into effect, a minor child entered the house of the father or mother pursuant to the provisions of Article 737 or Article 738 of the Former Act, that child may revert to the former surname within one year from the time of attaining the age of majority. The same applies within one year after the New Act came into effect, where that child attained the age of majority before the New Act came into effect.
machine translation, not official
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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-20261011T170941-012, translated 2026-10-12
- This site's parser, version 190 — 民法 — structure, counts, cross-references and defined terms, computed 2026-10-11