A parking assistance apparatus has a region detector capable of detecting a plurality of possible parking regions where a vehicle can park in at least one side to the left or right of the vehicle, a photographic image of the scenery surrounding the vehicle including the possible parking regions is displayed on a monitor device, the possible parking regions detected by the region detector are superimposed on the photographic image as graphic images showing parking target candidates in all of the corresponding positions, and one of the parking target candidates can be selected as a parking target on the basis of a command input from a driving device of the vehicle.