VEHICLE DRIVING SUPPORT DEVICE

A vehicle driving support device includes a turn-signal switch switched on by a driver of the vehicle in the vehicle's course change, a rear side detector that detects an approaching vehicle on a lane to which the course of the vehicle is to be changed, turn-signal lamps on the right and left sides of the vehicle, and a turn-signal display processor displaying one of the turn-signal lamps which is on the side of the lane when the turn-signal switch is on. The turn-signal display processor includes a closeness determiner that determines whether the approaching vehicle is close to the vehicle when the turn-signal switch is on and the rear side detector detects the approaching vehicle, and a standby-state processor that, if that the approaching vehicle is close to the vehicle, causes the one of the turn-signal lamps to be a standby state and informs the driver of the standby state.