# 民法 / Civil Code — 第四百五条 (Article 405)

- 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: 第四百五条 (Article 405)（利息の元本への組入れ） — address `art-405`
- Text in force since: 2026-06-24
- URL (the page that opens at this provision): https://japanlaw.org/en/civil-code/art-405
- Permanent URL (e-Gov law ID, never renamed): https://japanlaw.org/l/129AC0000000089/art-405
- 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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### 第四百五条（利息の元本への組入れ） — (Incorporation of Interest into Principal)
<sup>caption: Ministry of Justice translation — Japanese Law Translation Database System</sup>
<sup>art-405 · https://japanlaw.org/en/civil-code/art-405 · https://japanlaw.org/l/129AC0000000089/art-405</sup>

    **第一項**  利息の支払が一年分以上延滞した場合において、債権者が催告をしても、債務者がその利息を支払わないときは、債権者は、これを元本に組み入れることができる。
    <sup>art-405/par-1 · https://japanlaw.org/en/civil-code/art-405/par-1 · https://japanlaw.org/l/129AC0000000089/art-405/par-1</sup>
    If the payment of interest corresponding to one year or more is delayed, and if the obligor does not pay that interest notwithstanding the demand by the obligee, the obligee may incorporate that interest into the principal.
    <sup>Ministry of Justice translation — Japanese Law Translation Database System</sup>

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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
- This site's parser, version 190 — 民法 — structure, counts, cross-references and defined terms, computed 2026-10-11