A parking assist apparatus is provided with: a holding device configured to hold the target parking position associated with the parking process operation; an automatic parking device configured to perform an automatic parking control of automatically controlling the vehicle such that the vehicle is parked in the target parking position, as a part of the parking process operation; and a transition device configured to change the automatic parking control into a standby state while allowing the holding device to hold the target parking position, on condition that a door of the vehicle is opened before the vehicle arrives at the target parking position. The transition device is configured to allow the automatic parking device to restart the automatic parking control, on condition that there is an execution request for the automatic parking control, when the automatic parking control is in the standby state.