# Article 23, paragraph (2), its wordings — Arbitration Act

This is the Markdown twin of https://japanlaw.org/en/arbitration-act/history/art-23/par-2. 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 23, paragraph (2) (第二十三条第二項) changed with each amendment, and how it will change.

- Law: Arbitration Act (仲裁法) — https://japanlaw.org/en/arbitration-act
- Provision: Article 23, paragraph (2) (第二十三条第二項) — https://japanlaw.org/en/arbitration-act/art-23/par-2 (as Markdown: https://japanlaw.org/md/en/arbitration-act/art-23/par-2)
- 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:

> 仲裁手続において、仲裁廷が仲裁権限を有しない旨の主張は、その原因となる事由が仲裁手続の進行中に生じた場合にあってはその後速やかに、その他の場合にあっては本案についての最初の主張書面の提出の時（口頭審理において口頭で最初に本案についての主張をする時を含む。）までに、しなければならない。ただし、仲裁権限を有しない旨の主張の遅延について正当な理由があると仲裁廷が認めるときは、この限りでない。

English (Japanese Law Translation, Ministry of Justice):

> In an arbitration procedure, an allegation that an arbitral tribunal does not have jurisdiction must be made promptly after the occurrence of the cause for the allegation if the cause has occurred during the course of the arbitration procedure, or, in any other case, an allegation must be made by the time of submission of the first written allegation on the merits (including the time of orally making the first allegation on the merits in oral hearings); provided, however, that this does not apply when the arbitral tribunal finds justifiable grounds for a delay in making an allegation that the arbitral tribunal does not have jurisdiction.

## 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 25, paragraph (2); its words stay the same (Act No. 53 of 2023) — https://japanlaw.org/en/arbitration-act/amendments/20280613_505AC0000000053

Japanese:

> 仲裁手続において、仲裁廷が仲裁権限を有しない旨の主張は、その原因となる事由が仲裁手続の進行中に生じた場合にあってはその後速やかに、その他の場合にあっては本案についての最初の主張書面の提出の時（口頭審理において口頭で最初に本案についての主張をする時を含む。）までに、しなければならない。ただし、仲裁権限を有しない旨の主張の遅延について正当な理由があると仲裁廷が認めるときは、この限りでない。

English (Japanese Law Translation, Ministry of Justice):

> In an arbitration procedure, an allegation that an arbitral tribunal does not have jurisdiction must be made promptly after the occurrence of the cause for the allegation if the cause has occurred during the course of the arbitration procedure, or, in any other case, an allegation must be made by the time of submission of the first written allegation on the merits (including the time of orally making the first allegation on the merits in oral hearings); provided, however, that this does not apply when the arbitral tribunal finds justifiable grounds for a delay in making an allegation that the arbitral tribunal does not have jurisdiction.

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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)