A warning device for a vehicle according to the present invention, for starting warning in optimum timing depending on a position at which an object passes near the own vehicle, has warning means for warning a driver of presence of the object that will pass near the own vehicle. The warning device for the vehicle has timing changing means for changing timing of starting warning via the warning means according to a size of an allowance space from the own vehicle to an expected passing position at which the object is expected to pass near the own vehicle.
