To provide an electric-powered wheelchair seat, where the wheelchair user easily and simply aligns the wheelchair with a seat device within a car from the back of the wheelchair first, even if the user is physically handicapped.

The electric-powered wheelchair seat 1 comes directly to the front of the seat stand 25 after detecting the position of a seat stand 25 by laser, determining the distance between the seat stand 25 and the wheelchair by ultrasonic waves, and making the distance between the left and right ends of the electric-powered wheelchair seat 1 equal to the distance between the left and right ends of the seat stand 25. Accordingly, after the finish of this control, the wheelchair user only manually moves back the electric-powered wheelchair seat 1, couples it with a seat stand 25 and uses it as a seat device 10 in the car.

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