Translation guide
A person who is present at an event or incident but does not take part. In Japanese, the most natural translation depends on context: whether the person is simply a passerby, a witness, or someone uninvolved in a situation.
Referring to someone who happens to be near an event or incident, often without direct involvement.
Literally 'passerby'. Used for someone walking by, especially in street contexts.
通行人が事故を目撃した。
A bystander witnessed the accident.
Literally 'bystander' or 'onlooker'. Often used in discussions of the bystander effect or when emphasizing passive observation.
傍観者効果について話し合った。
We discussed the bystander effect.
Means 'people who happened to be there'. Natural for describing bystanders at an incident.
居合わせた人が助けを呼んだ。
A bystander called for help.
Someone who sees an event, especially a crime or accident, and may provide testimony.
Standard word for 'witness'. Emphasizes having seen something.
警察は目撃者を探している。
The police are looking for bystanders/witnesses.
Literally 'third party'. Used for someone not directly involved, often in legal or formal contexts.
Someone who is present but not taking sides or participating in a dispute or fight.
Means 'outsider' or 'person not concerned'. Suitable when emphasizing lack of involvement.
部外者は口を出さないでください。
Bystanders should not interfere.
Literally 'unrelated person'. Casual and clear.
無関係の人が巻き込まれた。
A bystander got caught up in it.
The English word 'bystander' covers several Japanese words. Using 傍観者 in casual conversation may sound overly academic. Choose based on whether the person is a passerby, witness, or uninvolved party.
第三者からの証言が重要だ。
Testimony from a bystander is important.