A control portion is configured to execute a preliminary movement process of causing a movement mechanism to execute a preliminary movement operation of moving the movement support body with an imaging device attached thereto to a preliminary target stop position that is preset as a target stop position and stopping the movement support body at the preliminary target stop position; an imaging process of causing the imaging device to image an imaging target location in a state in which the movement support body is stopped at the preliminary target stop position; an offset amount calculation process of calculating, based on a captured image obtained by the imaging process, a positional offset amount of the movement support body in a front-rear direction and a lateral direction from a proper position of the movement support body; and a correction process of correcting the preliminary target stop position based on the positional offset amount calculated by the offset amount calculation process and setting the target stop position.