# 私的独占の禁止及び公正取引の確保に関する法律 / Act on Prohibition of Private Monopolization and Maintenance of Fair Trade — 第十八条 (Article 18) This is the Markdown twin of https://japanlaw.org/ja/antimonopoly-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: 私的独占の禁止及び公正取引の確保に関する法律 (Act on Prohibition of Private Monopolization and Maintenance of Fair Trade), 昭和二十二年法律第五十四号 - English title "Act on Prohibition of Private Monopolization and Maintenance of Fair Trade": 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) — address `art-18` - Text in force since: 2026-05-21 - URL (the page that opens at this provision): https://japanlaw.org/ja/antimonopoly-act/art-18 - e-Gov law ID: 322AC0000000054 — 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. --- ### 第十八条 art-18 · https://japanlaw.org/ja/antimonopoly-act/art-18 **第一項** 公正取引委員会は、第十五条第二項及び同条第三項において読み替えて準用する第十条第八項の規定に違反して会社が合併した場合においては、合併の無効の訴えを提起することができる。 art-18/par-1 · https://japanlaw.org/ja/antimonopoly-act/art-18/par-1 If companies have merged in violation of the provisions of Article 15, paragraph (2) and Article 10, paragraph (8) as applied mutatis mutandis pursuant to Article 15, paragraph (3) following the deemed replacement of terms, the Japan Fair Trade Commission may bring an action to have the merger declared invalid. Ministry of Justice translation — Japanese Law Translation Database System **第二項** 前項の規定は、第十五条の二第二項及び第三項並びに同条第四項において読み替えて準用する第十条第八項の規定に違反して会社が共同新設分割又は吸収分割をした場合に準用する。この場合において、前項中「合併の無効の訴え」とあるのは、「共同新設分割又は吸収分割の無効の訴え」と読み替えるものとする。 art-18/par-2 · https://japanlaw.org/ja/antimonopoly-act/art-18/par-2 The provisions of the preceding paragraph apply mutatis mutandis to when companies have effected a joint incorporation-type split or an absorption-type split in violation of the provisions of Article 15-2, paragraphs (2) and (3) and Article 10, paragraph (8) as applied mutatis mutandis pursuant to Article 15-2, paragraph (4) following the deemed replacement of terms. In this case, the term "action seeking invalidation of the merger" in the preceding paragraph is deemed to be replaced with "action seeking invalidation of the joint incorporation-type split or the absorption-type split". Ministry of Justice translation — Japanese Law Translation Database System **第三項** 第一項の規定は、第十五条の三第二項及び同条第三項において読み替えて準用する第十条第八項の規定に違反して会社が共同株式移転をした場合に準用する。この場合において、第一項中「合併の無効の訴え」とあるのは、「共同株式移転の無効の訴え」と読み替えるものとする。 art-18/par-3 · https://japanlaw.org/ja/antimonopoly-act/art-18/par-3 The provisions of paragraph (1) are applied mutatis mutandis to when companies have effected a joint share transfer in violation of provisions of Article 15-3, paragraph (2) and Article 10, paragraph (8) as applied mutatis mutandis pursuant to Article 15-3, paragraph (3) following the deemed replacement of terms. In this case, the term "action seeking invalidation of the merger" in paragraph (1) is deemed to be replaced with "action seeking invalidation of the joint share transfer". Ministry of Justice translation with a slip corrected by this site — not the Ministry's text; the Ministry printed: "The provisions of paragraph (1) are applied mutatis mutandis to when companies have affected a joint share transfer in violation of provisions of Article 15-3, paragraph (2) and Article 10, paragraph (8) as applied mutatis mutandis pursuant to Article 15-3, paragraph (3) following the deemed replacement of terms. In this case, the term "action seeking invalidation of the merger" in paragraph (1) is deemed to be replaced with "action seeking invalidation of the joint share transfer"." — https://www.japaneselawtranslation.go.jp/en/laws/view/5212/tb --- ## Cites - art-18/par-1: 第十五条第二項 → 私的独占の禁止及び公正取引の確保に関する法律 第十五条第二項 (Article 15, paragraph (2)), art-15/par-2 — https://japanlaw.org/ja/antimonopoly-act/art-15/par-2 - art-18/par-1: 同条第三項 → 私的独占の禁止及び公正取引の確保に関する法律 第十五条第三項 (Article 15, paragraph (3)), art-15/par-3 — https://japanlaw.org/ja/antimonopoly-act/art-15/par-3 - art-18/par-1: 第十条第八項 → 私的独占の禁止及び公正取引の確保に関する法律 第十条第八項 (Article 10, paragraph (8)), art-10/par-8 — https://japanlaw.org/ja/antimonopoly-act/art-10/par-8 - art-18/par-2: 前項 → 私的独占の禁止及び公正取引の確保に関する法律 第十八条第一項 (Article 18, paragraph (1)), art-18/par-1 — https://japanlaw.org/ja/antimonopoly-act/art-18/par-1 - art-18/par-2: 第十五条の二第二項 → 私的独占の禁止及び公正取引の確保に関する法律 第十五条の二第二項 (Article 15-2, paragraph (2)), art-15-2/par-2 — https://japanlaw.org/ja/antimonopoly-act/art-15-2/par-2 - art-18/par-2: 第三項 → 私的独占の禁止及び公正取引の確保に関する法律 第十五条の二第三項 (Article 15-2, paragraph (3)), art-15-2/par-3 — https://japanlaw.org/ja/antimonopoly-act/art-15-2/par-3 - art-18/par-2: 同条第四項 → 私的独占の禁止及び公正取引の確保に関する法律 第十五条の二第四項 (Article 15-2, paragraph (4)), art-15-2/par-4 — https://japanlaw.org/ja/antimonopoly-act/art-15-2/par-4 - art-18/par-2: 第十条第八項 → 私的独占の禁止及び公正取引の確保に関する法律 第十条第八項 (Article 10, paragraph (8)), art-10/par-8 — https://japanlaw.org/ja/antimonopoly-act/art-10/par-8 - art-18/par-3: 第一項 → 私的独占の禁止及び公正取引の確保に関する法律 第十八条第一項 (Article 18, paragraph (1)), art-18/par-1 — https://japanlaw.org/ja/antimonopoly-act/art-18/par-1 - art-18/par-3: 第十五条の三第二項 → 私的独占の禁止及び公正取引の確保に関する法律 第十五条の三第二項 (Article 15-3, paragraph (2)), art-15-3/par-2 — https://japanlaw.org/ja/antimonopoly-act/art-15-3/par-2 - art-18/par-3: 同条第三項 → 私的独占の禁止及び公正取引の確保に関する法律 第十五条の三第三項 (Article 15-3, paragraph (3)), art-15-3/par-3 — https://japanlaw.org/ja/antimonopoly-act/art-15-3/par-3 - art-18/par-3: 第十条第八項 → 私的独占の禁止及び公正取引の確保に関する法律 第十条第八項 (Article 10, paragraph (8)), art-10/par-8 — https://japanlaw.org/ja/antimonopoly-act/art-10/par-8 ## Cited by 2 provisions cite this one. No official source publishes this direction. - 私的独占の禁止及び公正取引の確保に関する法律 第十八条第二項 — https://japanlaw.org/ja/antimonopoly-act/art-18/par-2 - 私的独占の禁止及び公正取引の確保に関する法律 第十八条第三項 — https://japanlaw.org/ja/antimonopoly-act/art-18/par-3 --- ## Sources - claude-opus-5-5 — Corrections to the Ministry of Justice's English of paragraphs, written 2026-11-06 - e-Gov 法令検索, Digital Agency (デジタル庁) — 私的独占の禁止及び公正取引の確保に関する法律 — the text in force from 2026-05-21 (https://laws.e-gov.go.jp/law/322AC0000000054/20260521_505AC0000000063), retrieved 2026-11-06 - Japanese Law Translation Database System, Ministry of Justice (法務省) — Act on Prohibition of Private Monopolization and Maintenance of Fair Trade (私的独占の禁止及び公正取引の確保に関する法律), Article 18, paragraph (3) — the Ministry of Justice's English as printed (https://www.japaneselawtranslation.go.jp/en/laws/view/5212/tb), retrieved 2026-11-06 - Japanese Law Translation Database System, Ministry of Justice (法務省) — Act on Prohibition of Private Monopolization and Maintenance of Fair Trade — Ministry of Justice translation (https://www.japaneselawtranslation.go.jp/en/laws/view/5212/tb), retrieved 2026-11-06 - This site's parser, version 225 — 私的独占の禁止及び公正取引の確保に関する法律 — structure, counts, cross-references and defined terms, computed 2026-11-06