Translation guide
In Japanese, the concept of a 'third party' is expressed through several terms that differ by context: a neutral outsider, a legal entity, or an uninvolved person. The most common and versatile term is 第三者.
第三者
third party (general)
Referring to someone who is not directly involved in a situation, often in a neutral or objective sense.
The standard term for a third party in most contexts, including legal, business, and everyday situations. It implies an external, uninvolved person or entity.
この問題は第三者を交えて話し合いましょう。
Let's discuss this issue with a third party present.
第三者からの意見を聞くことが大切です。
It's important to hear opinions from a third party.
Literally 'outsider,' often used when emphasizing that someone is not a member of a group or organization. Slightly more exclusive than 第三者.
部外者の立ち入りは禁止されています。
Entry by outsiders is prohibited.
Means 'another person' or 'stranger.' In some contexts, it can imply a third party, especially when contrasting with oneself or one's group. Less formal than 第三者.
他人に迷惑をかけてはいけません。
You must not cause trouble for others (third parties).
Referring to a third party in legal documents, contracts, or formal agreements.
The primary term used in legal contexts. It covers any person or entity not party to a contract or legal proceeding.
この契約は第三者に対して効力を持ちません。
This contract has no effect on third parties.
A common phrase meaning 'rights of a third party.' Used in legal discussions.
第三者の権利を侵害してはならない。
You must not infringe upon the rights of a third party.
Describing someone who happens to be present but is not participating, often in an incident or accident.
Also used for bystanders, especially in news reports or formal descriptions of events.
事故当時、第三者の目撃者がいました。
At the time of the accident, there was a third-party witness.
Literally 'bystander' or 'onlooker.' Emphasizes passive observation rather than involvement. Often used in psychological or social contexts.
第三者 is the most neutral and widely used term for a third party, suitable for legal, business, and everyday contexts. 部外者 emphasizes exclusion from a group and is often used in rules or restrictions. 他人 simply means 'another person' and can imply a third party in casual speech, but it lacks the formal or legal nuance of 第三者.
In English, 'third party' and 'third person' are sometimes confused. In Japanese, 第三者 means 'third party,' while 三人称 (さんにんしょう) means 'third person' in grammar. Do not use 三人称 to mean an uninvolved person.
傍観者は事件に関与していなかった。
The bystanders were not involved in the incident.