# 仲裁法 / Arbitration Act — 第十八条 (Article 18) This is the Markdown twin of https://japanlaw.org/ja/arbitration-act/art-18. 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: 仲裁法 (Arbitration Act), 平成十五年法律第百三十八号 - English title "Arbitration 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: 第十八条 (Article 18)（忌避の原因等） — address `art-18` - Text in force since: 2026-05-21 - URL (the page that opens at this provision): https://japanlaw.org/ja/arbitration-act/art-18 - Permanent URL (e-Gov law ID, never renamed): https://japanlaw.org/l/415AC0000000138/art-18 - 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. --- ### 第十八条（忌避の原因等） — (Grounds for a Challenge) caption: Ministry of Justice translation — Japanese Law Translation Database System art-18 · https://japanlaw.org/ja/arbitration-act/art-18 · https://japanlaw.org/l/415AC0000000138/art-18 **第一項** 当事者は、仲裁人に次に掲げる事由があるときは、当該仲裁人を忌避することができる。 art-18/par-1 · https://japanlaw.org/ja/arbitration-act/art-18/par-1 · https://japanlaw.org/l/415AC0000000138/art-18/par-1 If the following grounds are found with respect to an arbitrator, the parties may challenge the arbitrator: Ministry of Justice translation — Japanese Law Translation Database System **一** 当事者の合意により定められた仲裁人の要件を具備しないとき。 art-18/par-1/item-1 · https://japanlaw.org/ja/arbitration-act/art-18/par-1/item-1 · https://japanlaw.org/l/415AC0000000138/art-18/par-1/item-1 the arbitrator fails to satisfy the requirements provided by the agreement of the parties; or Ministry of Justice translation — Japanese Law Translation Database System **二** 仲裁人の公正性又は独立性を疑うに足りる相当な理由があるとき。 art-18/par-1/item-2 · https://japanlaw.org/ja/arbitration-act/art-18/par-1/item-2 · https://japanlaw.org/l/415AC0000000138/art-18/par-1/item-2 there are reasonable grounds to doubt the impartiality or independence of the arbitrator. Ministry of Justice translation — Japanese Law Translation Database System **第二項** 仲裁人を選任し、又は当該仲裁人の選任について推薦その他これに類する関与をした当事者は、当該選任後に知った事由を忌避の原因とする場合に限り、当該仲裁人を忌避することができる。 art-18/par-2 · https://japanlaw.org/ja/arbitration-act/art-18/par-2 · https://japanlaw.org/l/415AC0000000138/art-18/par-2 A party that has appointed an arbitrator or that has made a recommendation for appointment or otherwise similarly participated in the appointment of the arbitrator may challenge that arbitrator only if they do so on grounds that they become aware of after the appointment. Ministry of Justice translation — Japanese Law Translation Database System **第三項** 仲裁人への就任の依頼を受けてその交渉に応じようとする者は、当該依頼をした者に対し、自己の公正性又は独立性に疑いを生じさせるおそれのある事実の全部を開示しなければならない。 art-18/par-3 · https://japanlaw.org/ja/arbitration-act/art-18/par-3 · https://japanlaw.org/l/415AC0000000138/art-18/par-3 A person who has been requested to assume the post of an arbitrator and intends to accept the negotiation must disclose to the person that made the request all facts that would be likely to give rise to doubts as to their impartiality or independence. Ministry of Justice translation — Japanese Law Translation Database System **第四項** 仲裁人は、仲裁手続の進行中、当事者に対し、自己の公正性又は独立性に疑いを生じさせるおそれのある事実（既に開示したものを除く。）の全部を遅滞なく開示しなければならない。 art-18/par-4 · https://japanlaw.org/ja/arbitration-act/art-18/par-4 · https://japanlaw.org/l/415AC0000000138/art-18/par-4 An arbitrator must disclose all the facts that would be likely to give rise to doubts as to their impartiality or independence (excluding those which have already been disclosed) to the parties without delay during the course of the arbitration procedure. Ministry of Justice translation — Japanese Law Translation Database System ## Cited by 4 provisions cite this one. No official source publishes this direction. - 仲裁法 第八条第一項第三号（仲裁地が定まっていない場合における裁判所の関与） — https://japanlaw.org/ja/arbitration-act/art-8/par-1/item-3 · https://japanlaw.org/l/415AC0000000138/art-8/par-1/item-3 - 仲裁法 第十九条第三項（忌避の手続） — https://japanlaw.org/ja/arbitration-act/art-19/par-3 · https://japanlaw.org/l/415AC0000000138/art-19/par-3 - 仲裁法 第二十一条第二項（仲裁人の任務の終了） — https://japanlaw.org/ja/arbitration-act/art-21/par-2 · https://japanlaw.org/l/415AC0000000138/art-21/par-2 - 仲裁法 附則第七条第一項（仲裁廷に対する忌避の申立てに関する経過措置） — https://japanlaw.org/ja/arbitration-act/suppl-4151-138/art-7/par-1 · https://japanlaw.org/l/415AC0000000138/suppl-4151-138/art-7/par-1 --- ## Sources - e-Gov 法令検索, Digital Agency (デジタル庁) — 仲裁法 — the text in force from 2026-05-21 (https://laws.e-gov.go.jp/law/415AC0000000138/20260521_504AC0000000048), retrieved 2026-11-01 - Japanese Law Translation Database System, Ministry of Justice (法務省) — Arbitration Act — Ministry of Justice translation (https://www.japaneselawtranslation.go.jp/en/laws/view/4440/tb), retrieved 2026-11-01 - This site's parser, version 219 — 仲裁法 — structure, counts, cross-references and defined terms, computed 2026-11-01