A parking assist system includes: an external environment information acquiring device, a parking space extracting device, a display device, a selection input member, and a control device. The control device is configured to set a parking position candidate at a prescribed position in a parking space, to set the parking position candidate selected by a user as a target parking position, to calculate a first trajectory to the target parking position, and to execute a first driving process to autonomously move a vehicle along the first trajectory. The control device is configured to set a corrected parking position different from the target parking position, to calculate a second trajectory from the target parking position to the corrected parking position, and to execute a second driving process to autonomously move the vehicle along the second trajectory.