# 不正競争防止法 / Unfair Competition Prevention Act — 第五条の二 (Article 5-2) - Law: 不正競争防止法 (Unfair Competition Prevention Act), 平成五年法律第四十七号 - English title "Unfair Competition Prevention 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: 第五条の二 (Article 5-2)（技術上の秘密を取得した者の当該技術上の秘密を使用する行為等の推定） — address `art-5-2` - Text in force since: 2026-05-21 - URL (the page that opens at this provision): https://japanlaw.org/ja/unfair-competition-prevention-act/art-5-2 - Permanent URL (e-Gov law ID, never renamed): https://japanlaw.org/l/405AC0000000047/art-5-2 - 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. --- ### 第五条の二（技術上の秘密を取得した者の当該技術上の秘密を使用する行為等の推定） — (Presumptions Regarding a Person Using a Technical Secret they Acquired) caption: Ministry of Justice translation — Japanese Law Translation Database System art-5-2 · https://japanlaw.org/ja/unfair-competition-prevention-act/art-5-2 · https://japanlaw.org/l/405AC0000000047/art-5-2 **第一項** 技術上の秘密（生産方法その他政令で定める情報に係るものに限る。以下この条において同じ。）について第二条第一項第四号、第五号又は第八号に掲げる不正競争（営業秘密を取得する行為に限る。）があった場合において、その行為をした者が当該技術上の秘密を使用する行為により生ずる物の生産その他技術上の秘密を使用したことが明らかな行為として政令で定める行為（以下この条において「生産等」という。）をしたときは、その者は、それぞれ当該各号に掲げる不正競争（営業秘密を使用する行為に限る。）として生産等をしたものと推定する。 art-5-2/par-1 · https://japanlaw.org/ja/unfair-competition-prevention-act/art-5-2/par-1 · https://japanlaw.org/l/405AC0000000047/art-5-2/par-1 If any of the acts stated in Article 2, paragraph (1), item (iv), (v), or (viii) (limited to acts of acquiring trade secrets) have been conducted with regard to a technical secret (limited to a technical secret concerning manufacturing methods or other information specified by Cabinet Order; the same applies below in this Article), and a person that has conducted such an act produces things using the technical secret or engages in other acts specified by Cabinet Order as acts from which it can be clearly understood that the technical secret has been used (referred to as "production, etc." in this Article below), the person is presumed to have engaged in production, etc. as an act stated in each item (limited to acts of using trade secrets). Ministry of Justice translation — Japanese Law Translation Database System **第二項** 技術上の秘密を取得した後にその技術上の秘密について営業秘密不正取得行為が介在したことを知って、又は重大な過失により知らないで、その技術上の秘密に係る技術秘密記録媒体等（技術上の秘密が記載され、又は記録された文書、図画又は記録媒体をいう。以下この条において同じ。）、その技術上の秘密が化体された物件又は当該技術秘密記録媒体等に係る送信元識別符号（自動公衆送信（公衆によって直接受信されることを目的として公衆からの求めに応じ自動的に送信を行うことをいい、放送又は有線放送に該当するものを除く。）の送信元を識別するための文字、番号、記号その他の符号をいう。第四項において同じ。）を保有する行為があった場合において、その行為をした者が生産等をしたときは、その者は、第二条第一項第六号に掲げる不正競争（営業秘密を使用する行為に限る。）として生産等をしたものと推定する。 art-5-2/par-2 · https://japanlaw.org/ja/unfair-competition-prevention-act/art-5-2/par-2 · https://japanlaw.org/l/405AC0000000047/art-5-2/par-2 If a person possesses a recording medium containing a technical secret (meaning a document, drawing, or recording medium on which technical secrets are described or recorded; the same applies below in this Article), an object that represents the technical secret, or a transmitter identification code (meaning letters, numbers, symbols, or any other codes used to identify the transmitter of an automatic public transmission (meaning a transmission made automatically in response to a public request for direct reception by the public, excluding an automatic public transmissions that are classified as broadcasts or cablecasts); the same applies in paragraph (4)) associated with the recording medium containing the technical secret, after acquiring the technical secret, learns that there had been an intervening act of wrongful acquisition of trade secrets with regard to the relevant technical secret, or is unaware of that fact due to gross negligence, and the person engages in production, etc., the person is presumed to have engaged in production, etc. as an act of unfair competition as stated in Article 2, paragraph (1), item (vi) (limited to the act of using a trade secret). Ministry of Justice translation — Japanese Law Translation Database System **第三項** 技術上の秘密をその保有者から示された後に、不正の利益を得る目的で、又は当該技術上の秘密の保有者に損害を加える目的で、当該技術上の秘密の管理に係る任務に違反して、次に掲げる方法でその技術上の秘密を領得する行為があった場合において、その行為をした者が生産等をしたときは、その者は、第二条第一項第七号に掲げる不正競争（営業秘密を使用する行為に限る。）として生産等をしたものと推定する。 art-5-2/par-3 · https://japanlaw.org/ja/unfair-competition-prevention-act/art-5-2/par-3 · https://japanlaw.org/l/405AC0000000047/art-5-2/par-3 If, after a technical secret has been disclosed by its holder, a person obtains the technical secret by any of the following means in violation of the duty to manage the technical secret, for the purpose of wrongful gain or causing damage to the holder of the technical secret, and the person engages in production, etc., the person is presumed to have engaged in production, etc., as an act of unfair competition (limited to the act of using a trade secret) as stated in Article 2, paragraph (1), item (vii): Ministry of Justice translation — Japanese Law Translation Database System **一** 技術秘密記録媒体等又は技術上の秘密が化体された物件を横領すること。 art-5-2/par-3/item-1 · https://japanlaw.org/ja/unfair-competition-prevention-act/art-5-2/par-3/item-1 · https://japanlaw.org/l/405AC0000000047/art-5-2/par-3/item-1 misappropriating a recording medium containing technical secrets, etc. or an object that represents technical secrets; Ministry of Justice translation — Japanese Law Translation Database System **二** 技術秘密記録媒体等の記載若しくは記録について、又は技術上の秘密が化体された物件について、その複製を作成すること。 art-5-2/par-3/item-2 · https://japanlaw.org/ja/unfair-competition-prevention-act/art-5-2/par-3/item-2 · https://japanlaw.org/l/405AC0000000047/art-5-2/par-3/item-2 reproducing a description or a record from a recording medium containing technical secrets, etc., or an object that represents technical secrets; or Ministry of Justice translation — Japanese Law Translation Database System **三** 技術秘密記録媒体等の記載又は記録であって、消去すべきものを消去せず、かつ、当該記載又は記録を消去したように仮装すること。 art-5-2/par-3/item-3 · https://japanlaw.org/ja/unfair-competition-prevention-act/art-5-2/par-3/item-3 · https://japanlaw.org/l/405AC0000000047/art-5-2/par-3/item-3 not deleting a description or a record that should be deleted from a recording medium containing a technical secret, etc., and disguising this act as if the description or record in the recording medium containing the technical secrets, etc. had been deleted. Ministry of Justice translation — Japanese Law Translation Database System **第四項** 技術上の秘密を取得した後にその技術上の秘密について営業秘密不正開示行為があったこと若しくは営業秘密不正開示行為が介在したことを知って、又は重大な過失により知らないで、その技術上の秘密に係る技術秘密記録媒体等、その技術上の秘密が化体された物件又は当該技術秘密記録媒体等に係る送信元識別符号を保有する行為があった場合において、その行為をした者が生産等をしたときは、その者は、第二条第一項第九号に掲げる不正競争（営業秘密を使用する行為に限る。）として生産等をしたものと推定する。 art-5-2/par-4 · https://japanlaw.org/ja/unfair-competition-prevention-act/art-5-2/par-4 · https://japanlaw.org/l/405AC0000000047/art-5-2/par-4 If a person possesses a recording medium containing the technical secret, an object that represents the technical secret, or a transmitter identification code associated with a recording medium containing the technical secret, after acquiring the technical secret, learns that an act of improper disclosure of the trade secret has occurred with regard to the technical secret, or that there had been an intervening act of improper disclosure, or is unaware of this fact due to gross negligence, and the person engages in production, etc., the person is presumed to have engaged in production, etc., as unfair competition as stated in Article 2, paragraph (1), item (ix) (limited to the act of using a trade secret). Ministry of Justice translation — Japanese Law Translation Database System --- ## Cites - art-5-2/par-1: この条 → 不正競争防止法 第五条の二 (Article 5-2), art-5-2 — https://japanlaw.org/ja/unfair-competition-prevention-act/art-5-2 · https://japanlaw.org/l/405AC0000000047/art-5-2 - art-5-2/par-1: 第二条第一項第四号 → 不正競争防止法 第二条第一項第四号 (Article 2, paragraph (1), item (iv)), art-2/par-1/item-4 — https://japanlaw.org/ja/unfair-competition-prevention-act/art-2/par-1/item-4 · https://japanlaw.org/l/405AC0000000047/art-2/par-1/item-4 - art-5-2/par-1: 第五号 → 不正競争防止法 第二条第一項第五号 (Article 2, paragraph (1), item (v)), art-2/par-1/item-5 — https://japanlaw.org/ja/unfair-competition-prevention-act/art-2/par-1/item-5 · https://japanlaw.org/l/405AC0000000047/art-2/par-1/item-5 - art-5-2/par-1: 第八号 → 不正競争防止法 第二条第一項第八号 (Article 2, paragraph (1), item (viii)), art-2/par-1/item-8 — https://japanlaw.org/ja/unfair-competition-prevention-act/art-2/par-1/item-8 · https://japanlaw.org/l/405AC0000000047/art-2/par-1/item-8 - art-5-2/par-2: この条 → 不正競争防止法 第五条の二 (Article 5-2), art-5-2 — https://japanlaw.org/ja/unfair-competition-prevention-act/art-5-2 · https://japanlaw.org/l/405AC0000000047/art-5-2 - art-5-2/par-2: 第四項 → 不正競争防止法 第五条の二第四項 (Article 5-2, paragraph (4)), art-5-2/par-4 — https://japanlaw.org/ja/unfair-competition-prevention-act/art-5-2/par-4 · https://japanlaw.org/l/405AC0000000047/art-5-2/par-4 - art-5-2/par-2: 第二条第一項第六号 → 不正競争防止法 第二条第一項第六号 (Article 2, paragraph (1), item (vi)), art-2/par-1/item-6 — https://japanlaw.org/ja/unfair-competition-prevention-act/art-2/par-1/item-6 · https://japanlaw.org/l/405AC0000000047/art-2/par-1/item-6 - art-5-2/par-3: 第二条第一項第七号 → 不正競争防止法 第二条第一項第七号 (Article 2, paragraph (1), item (vii)), art-2/par-1/item-7 — https://japanlaw.org/ja/unfair-competition-prevention-act/art-2/par-1/item-7 · https://japanlaw.org/l/405AC0000000047/art-2/par-1/item-7 - art-5-2/par-4: 第二条第一項第九号 → 不正競争防止法 第二条第一項第九号 (Article 2, paragraph (1), item (ix)), art-2/par-1/item-9 — https://japanlaw.org/ja/unfair-competition-prevention-act/art-2/par-1/item-9 · https://japanlaw.org/l/405AC0000000047/art-2/par-1/item-9 ## Cited by 7 provisions cite this one. No official source publishes this direction. - 不正競争防止法 第五条の二第一項（技術上の秘密を取得した者の当該技術上の秘密を使用する行為等の推定） — https://japanlaw.org/ja/unfair-competition-prevention-act/art-5-2/par-1 · https://japanlaw.org/l/405AC0000000047/art-5-2/par-1 - 不正競争防止法 第五条の二第二項（技術上の秘密を取得した者の当該技術上の秘密を使用する行為等の推定） — https://japanlaw.org/ja/unfair-competition-prevention-act/art-5-2/par-2 · https://japanlaw.org/l/405AC0000000047/art-5-2/par-2 - 不正競争防止法 第十九条第一項（適用除外等） — https://japanlaw.org/ja/unfair-competition-prevention-act/art-19/par-1 · https://japanlaw.org/l/405AC0000000047/art-19/par-1 - 不正競争防止法 附則第二条第一項（経過措置） — https://japanlaw.org/ja/unfair-competition-prevention-act/suppl-4271-54/art-2/par-1 · https://japanlaw.org/l/405AC0000000047/suppl-4271-54/art-2/par-1 - 不正競争防止法 附則第二条第二項（不正競争防止法の一部改正に伴う経過措置） — https://japanlaw.org/ja/unfair-competition-prevention-act/suppl-5051-51/art-2/par-2 · https://japanlaw.org/l/405AC0000000047/suppl-5051-51/art-2/par-2 - 不正競争防止法 附則第二条第三項（不正競争防止法の一部改正に伴う経過措置） — https://japanlaw.org/ja/unfair-competition-prevention-act/suppl-5051-51/art-2/par-3 · https://japanlaw.org/l/405AC0000000047/suppl-5051-51/art-2/par-3 - 不正競争防止法 附則第二条第四項（不正競争防止法の一部改正に伴う経過措置） — https://japanlaw.org/ja/unfair-competition-prevention-act/suppl-5051-51/art-2/par-4 · https://japanlaw.org/l/405AC0000000047/suppl-5051-51/art-2/par-4 --- ## Sources - e-Gov 法令検索, Digital Agency (デジタル庁) — 不正競争防止法 — the text in force from 2026-05-21 (https://laws.e-gov.go.jp/law/405AC0000000047/20260521_507AC0000000039), retrieved 2026-10-11 - Japanese Law Translation Database System, Ministry of Justice (法務省) — Unfair Competition Prevention Act — Ministry of Justice translation (https://www.japaneselawtranslation.go.jp/en/laws/view/4920/tb), retrieved 2026-10-11 - This site's parser, version 189 — 不正競争防止法 — structure, counts, cross-references and defined terms, computed 2026-10-11