# Article 18, paragraph (4), its wordings — Arbitration Act

This is the Markdown twin of https://japanlaw.org/en/arbitration-act/history/art-18/par-4. 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.

How the wording of Article 18, paragraph (4) (第十八条第四項) changed with each amendment, and how it will change.

- Law: Arbitration Act (仲裁法) — https://japanlaw.org/en/arbitration-act
- Provision: Article 18, paragraph (4) (第十八条第四項) — https://japanlaw.org/en/arbitration-act/art-18/par-4 (as Markdown: https://japanlaw.org/md/en/arbitration-act/art-18/par-4)
- The law's amendments: https://japanlaw.org/en/arbitration-act/amendments
- 2 wordings, oldest first.

## 1. Before Act No. 53 of 2023

- State: In force

Japanese:

> 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。

English (Japanese Law Translation, Ministry of Justice):

> 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.

## 2. By 13 June 2028 — Act No. 53 of 2023

- State: Not yet in force
- Takes effect: By 13 June 2028
- The amendment: Moved to Article 20, paragraph (4); its words stay the same (Act No. 53 of 2023) — https://japanlaw.org/en/arbitration-act/amendments/20280613_505AC0000000053

Japanese:

> 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。

English (Japanese Law Translation, Ministry of Justice):

> 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.

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## Sources

- The dates and the amending laws: e-Gov (Digital Agency) (https://laws.e-gov.go.jp/law/415AC0000000138)
- English name of the law: Japanese Law Translation, Ministry of Justice (https://www.japaneselawtranslation.go.jp/en/laws/view/4440/tb)
- English titles of the amending laws: Written for this site with AI
- The Japanese text before: e-Gov (Digital Agency) (https://laws.e-gov.go.jp/law/415AC0000000138/20260521_504AC0000000048)
- The Japanese text after: e-Gov (Digital Agency) (https://laws.e-gov.go.jp/law/415AC0000000138/20280613_505AC0000000053)