In a driving assistance apparatus, an area setter is configured to set a warning area on at least one of a left rear side and a right rear side of a subject vehicle. A notifier is configured to provide a notification in response to an object detector detecting an object in the warning area. A determiner is configured to determine initiation and completion of a turn at an intersection during turning of the subject vehicle at the intersection. An area changer is configured to, in response to the determiner determining the initiation of the turn, reduce the warning area in a direction approaching the subject vehicle, and in response to the determiner determining the completion of the turn, expand the reduced warning area according to a traveling state of the subject vehicle after the completion of the turn.