DRIVING SUPPORT DEVICE

A driving support device including: an in-vehicle sensor configured to acquire and output each of position information relating to a position of an own vehicle, target information relating to a target positioned around the own vehicle, and operation information relating to an operation of an operating element of the own vehicle; and a control device having a lane departure prevention function for preventing the own vehicle from departing from a lane in which the own vehicle is traveling by activating at least one device among a notification device, a drive device, and a braking device mounted on the own vehicle in a situation in which an accelerator pedal of the own vehicle is erroneously operated and an angle between a traveling direction of the own vehicle and a boundary line of the lane detected based on the target information is equal to or less than a predetermined threshold value.