Translation guide
The English word 'informer' refers to someone who provides information, often to authorities, about others' activities. In Japanese, the translation depends heavily on context: whether the person is a police informant, a whistleblower, a spy, or simply someone who tells on others. This guide covers the most common and natural ways to express these nuances.
A person who secretly gives information to the police or authorities about criminal activities, often in exchange for money or leniency.
A neutral, formal term for 'information provider'. Commonly used in news reports and official contexts to refer to police informants or tipsters.
警察は情報提供者のおかげで犯人を逮捕した。
The police arrested the criminal thanks to an informer.
Literally 'secret informer'. Carries a negative connotation of betrayal or snitching. Often used in criminal underworld contexts.
Can sound like 'snitch' or 'rat'. Use with care as it implies disloyalty.
彼は組織の密告者として警察に協力した。
He cooperated with the police as an informer for the organization.
Slang for a tipster or informant, often used in media or police jargon. 'タレコミ' means 'tip-off'.
週刊誌の記者はタレコミ屋から情報を買った。
The weekly magazine reporter bought information from an informer.
A person who exposes wrongdoing within an organization, often at personal risk, for the public good.
Standard term for 'whistleblower'. Refers to someone who reports illegal or unethical practices from inside an organization.
内部告発者が会社の不正を明らかにした。
The whistleblower exposed the company's misconduct.
Shorter form meaning 'accuser' or 'whistleblower'. Can be used in legal or general contexts.
告発者は証拠を提出した。
The informer submitted evidence.
A person who secretly collects information for a government or organization, often in espionage contexts.
Common loanword for 'spy'. Covers both professional spies and informants in espionage.
彼は敵国のスパイとして活動していた。
He was working as a spy for the enemy country.
Formal term for 'intelligence agent' or 'informant'. Used in government or military contexts.
情報員が重要な機密を提供した。
The informer provided important classified information.
A person who tells on someone for minor misdeeds, often in everyday situations like school or work.
Colloquial term for a tattletale or snitch. 'チクリ' is onomatopoeic for a sharp sting, implying a sneaky report.
あの子はすぐ先生に言うチクリ屋だ。
That kid is a tattletale who tells the teacher right away.
Also used in casual contexts for 'snitch', but can sound overly dramatic. See caution in police meaning.
May sound too strong for minor tattling; use チクリ屋 for lighter nuance.
彼は密告者呼ばわりされた。
He was called a snitch.
情報提供者 is a neutral 'information provider', often used by police. 密告者 implies secret betrayal and is negative. 内部告発者 is specifically a whistleblower exposing organizational wrongdoing, often seen as heroic.
Directly translating 'informer' as インフォーマー is not natural in Japanese. Use the context-appropriate terms above.