A parking assist apparatus includes a display portion mounted at a vehicle and displaying a parking assist image in which an estimated course line generated in association with an operation of a steering wheel is superimposed on a captured image of a surrounding of the vehicle, and an auxiliary image controlling portion displaying an auxiliary image in place of the parking assist image in a state where the parking assist image is displayed on the display portion, the auxiliary image including a virtual vehicle representing the vehicle and a virtual estimated course line corresponding to the estimated course line for the virtual vehicle.