A person who has caused harm in an incident or accident; the perpetrator or offending party.
警察は加害者を特定し、取り調べを始めた。
The police identified the perpetrator and began questioning them.
交通事故の報告書には、加害者と被害者の双方の証言が記載されている。
The traffic accident report contains testimony from both the perpetrator and the victim.
裁判では加害者の過失の度合いが重要な争点になった。
In the trial, the degree of the perpetrator's negligence became an important issue.