To protrude an in-cabin seat to an outside of a cabin to be seated, and bring thereafter the seat into the cabin after seated, so that the handicapped, the sick, the aged or the like using a wheelchair is easily seated on the seat inside the automobile.

The seat 3B constituted to be movable separately is slide to be protruded from a rear getting-on and -off port 6 of the automobile 1 toward its outside, the seat 3B is easily pulled out outside the automobile by a handle 8 provided in an end part of the seat 3B, and the seat 3B is stably supported on the ground by lowering downwards leg parts 10 with casters 9 stored elevatably inside the seat 3B to allow stable seating on the seat 3B pulled-out outside the automobile 1.