A driving assist apparatus that performs, in accordance with periphery monitoring information of an own vehicle acquired from a periphery monitoring apparatus, a driving assist operation of the own vehicle. The driving assist apparatus is provided with a travelling locus calculation unit that calculates a travelling locus of the own vehicle; an operation region calculation unit that calculates an operation region in the vicinity of the own vehicle; a lane change detection unit that detects a lane change of the own vehicle; an operation region correction unit that corrects the operation region based on lane information related to a traffic lane after the lane change of the own vehicle; and an operation determination unit that determines, when an object is detected in the operation region, whether the driving assist operation needs to be activated based on the periphery monitoring information.