A seat apparatus includes a seat back capable of being used as a table at a surface thereof, a seat back driving device moving the seat back between a seating position and a table position, a controlling portion controlling the seat back driving device, and the controlling portion including an operating portion at which the user executes a certain operation, wherein, when the user executes the certain operation, the controlling portion controls the seat back to move in a first direction that is opposite to a second direction to which the seat back is moved most recently.