Provided is a vehicle seat apparatus for a vehicle capable of executing a manual steering mode in which a vehicle occupant steers the vehicle by using a steering device and an automatic steering mode in which steering of the vehicle is controlled without intervention of the occupant. The vehicle seat apparatus includes a seat back, an arm rest, and a controller. The seat back is configured to support a back of the occupant. The arm rest is configured to support an arm of the occupant. The controller is configured to moves at least one of the seat hack and the arm rest. During a transition period of the vehicle from the automatic steering mode to the manual steering mode, the controller performs control to move the seat back in a direction to raise the seat back and performs control to move at least a portion of the arm rest forward.