A power seat operation device is configured in such a manner that, when a dial member is rotated and operated, a movable mechanism which is to be operated is selected from among movable mechanisms. When a switch member is rotated and operated, the selected movable mechanism is actuated. The switch member is rotated and operated about a rotation axis extending in the widthwise direction of the seat. Thus the direction of operation of the switch member can be aligned with or nearly aligned with both the direction of the actual movement of a seat back when a recliner mechanism is actuated and the direction of the actual movement of an ottoman when an ottoman mechanism is actuated. Also, in a state in which a seat slide mechanism is selected, the direction of the operation of the switch member is aligned with the front-rear direction of the seat.