DRIVING SUPPORT DEVICE

A driving support device includes: an obstacle detection unit (14) configured to detect an obstacle present in front of a host vehicle; a collision avoidance support control unit (11) configured to calculate a first target steering control amount for collision avoidance when the host vehicle is likely to collide with the obstacle; a lane detection unit (14) configured to detect a lane in which the host vehicle travels; a lane departure avoidance support control unit (12) configured to calculate a second target steering control amount for maintaining the traveling of the host vehicle along the lane based on a departure amount representing a degree to which the host vehicle departs from the lane; and an arbitration control unit (13) configured to decide a steering control amount for a steered wheel based on the first target steering control amount and the second target steering control amount such that the first target steering control amount contributes higher to determine the steering control amount for the steered wheel than the second target steering control amount and control the steered wheel based on the steering control amount decided by the arbitration control unit.