To arrange a wire harness, being off from a hinge and a weather strip toward the passenger compartment.

In an accommodation casing having a space in which a wire harness is wound and accommodation, an insertion port and a draw-out port 10g opposed to each other, a harness fixing piece projected from the outer surface of the insertion port, the wire harness is inserted into the casing through the insertion port and is wound on a spiral spring 30, and thereafter, it is led out through the draw-out port 10g. The casing is secured to one of the door and the vehicle body, and the wire harness led out from the draw-out port is led to the other one of the door or the vehicle body, and is locked thereto by means of a clamp. With arrangement, the wiring diameter of the wire harness set in the casing varies in response to opening and closing operation of the door so as to extend and retract the wire harness following the operation of the door.