# 会社法 / Companies Act — 第三百五十五条 (Article 355) This is the Markdown twin of https://japanlaw.org/ja/companies-act/art-355. Every law, and how to address a provision: https://japanlaw.org/llms.txt. The same laws as MCP tools (no sign-in): https://japanlaw.org/mcp. - Law: 会社法 (Companies Act), 平成十七年法律第八十六号 - English title "Companies 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: 第三百五十五条 (Article 355)（忠実義務） — address `art-355` - Text in force since: 2026-08-12 - URL (the page that opens at this provision): https://japanlaw.org/ja/companies-act/art-355 - e-Gov law ID: 417AC0000000086 — never renamed. A permanent link, `/l/{lawId}/{address}` on this site, redirects to the page. - Every provision below carries its address and its URL 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. --- ### 第三百五十五条（忠実義務） — (Duty of Loyalty) caption: Ministry of Justice translation — Japanese Law Translation Database System art-355 · https://japanlaw.org/ja/companies-act/art-355 **第一項** 取締役は、法令及び定款並びに株主総会の決議を遵守し、株式会社のため忠実にその職務を行わなければならない。 art-355/par-1 · https://japanlaw.org/ja/companies-act/art-355/par-1 Directors must perform their duties for the stock company in a loyal manner in compliance with laws and regulations, the articles of incorporation, and resolutions at shareholders meetings. Ministry of Justice translation — Japanese Law Translation Database System ## Cited by 2 provisions cite this one. No official source publishes this direction. - 会社法 第四百十九条第二項（執行役の監査委員に対する報告義務等） — https://japanlaw.org/ja/companies-act/art-419/par-2 - 会社法 第四百八十二条第四項（業務の執行） — https://japanlaw.org/ja/companies-act/art-482/par-4 --- ## Sources - e-Gov 法令検索, Digital Agency (デジタル庁) — 会社法 — the text in force from 2026-08-12 (https://laws.e-gov.go.jp/law/417AC0000000086/20260812_508AC0000000064), retrieved 2026-09-17 - Japanese Law Translation Database System, Ministry of Justice (法務省) — Companies Act — Ministry of Justice translation (part 1 of 2) (https://www.japaneselawtranslation.go.jp/en/laws/view/4481/tb), retrieved 2026-09-17 - This site's parser, version 224 — 会社法 — structure, counts, cross-references and defined terms, computed 2026-09-17