noun
side mirror; sideview mirror
Refers to the external mirror on a vehicle's door, used to see behind and to the side. A common loanword from English.
from English side mirror
運転する前に、サイドミラーの角度を確認してください。
Before driving, please check the angle of the side mirrors.
駐車するときはサイド
When parking, please look carefully at the side mirrors.