# 労働契約法 / Labor Contracts Act — 第九条 (Article 9)

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- Law: 労働契約法 (Labor Contracts Act), 平成十九年法律第百二十八号
- English title "Labor Contracts Act": 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: 第九条 (Article 9)（就業規則による労働契約の内容の変更） — address `art-9`
- Text in force since: 2020-04-01
- URL (the page that opens at this provision): https://japanlaw.org/ja/labor-contracts-act/art-9
- Permanent URL (e-Gov law ID, never renamed): https://japanlaw.org/l/419AC0000000128/art-9
- 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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### 第九条（就業規則による労働契約の内容の変更） — (Change to the Contents of a Labor Contract Based on Rules of Employment)
<sup>caption: Ministry of Justice translation — Japanese Law Translation Database System</sup>
<sup>art-9 · https://japanlaw.org/ja/labor-contracts-act/art-9 · https://japanlaw.org/l/419AC0000000128/art-9</sup>

**第一項**  使用者は、労働者と合意することなく、就業規則を変更することにより、労働者の不利益に労働契約の内容である労働条件を変更することはできない。ただし、次条の場合は、この限りでない。
<sup>art-9/par-1 · https://japanlaw.org/ja/labor-contracts-act/art-9/par-1 · https://japanlaw.org/l/419AC0000000128/art-9/par-1</sup>
An Employer may not change any of the working conditions that constitute the contents of a labor contract in a manner disadvantageous to a Worker by changing the rules of employment, unless an agreement to do so has been reached with the Worker; provided, however, that this does not apply to the cases set forth in the following Article.
<sup>Ministry of Justice translation — Japanese Law Translation Database System</sup>

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## Cites
- art-9/par-1: 次条 → 労働契約法 第十条 (Article 10), art-10 — https://japanlaw.org/ja/labor-contracts-act/art-10 · https://japanlaw.org/l/419AC0000000128/art-10

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## Sources

- e-Gov 法令検索, Digital Agency (デジタル庁) — 労働契約法 — the text in force from 2020-04-01 (https://laws.e-gov.go.jp/law/419AC0000000128/20200401_430AC0000000071), retrieved 2026-09-10
- Japanese Law Translation Database System, Ministry of Justice (法務省) — Labor Contracts Act — Ministry of Justice translation (https://www.japaneselawtranslation.go.jp/en/laws/view/3744/tb), retrieved 2026-09-10
- This site's parser, version 211 — 労働契約法 — structure, counts, cross-references and defined terms, computed 2026-09-10