PURPOSE: To easily adjust a seat position by placing a control unit on the seat side which controls movement of each portion of the seat, supplying a supply circuit from a power source in a board and connecting each selectable stud to a circuit of a motor with a reversing device for controlling a portion of the seat.

CONSTITUTION: A stud transmission wheel 30 in a control unit having a lot of studs 31-41 in the surroundings thereof supplies electric current to a lot of motors 1-10 and 12 via eleven lines 52 and a common line 53 from a push button 50 connected to supply circuits 25, 26 and 51 which are located on a board of a vehicle and has a power source to make each motor achieve each respective work as follows: motor 1: adjustment of a slide member, motor 2: positioning of a under-thigh cushion, motor 3: adjustment of raising sitting portion, motor 4: adjustment of inclination of back portion of the seat, motor 5: control for raising or lowering the upper part 7b, motor 6: adjustment of the part of the lumbar cushion, motor 7: adjustment of inclination of head support portion, motors 8-10 and 12: various other adjustments of the back portion of the seat.