A wiring apparatus includes a spool; an annular reel surrounding the spool to be rotatable about an axis common with the spool, the reel being previously wound with a wire in layers to be wound on the spool; a winding arm for guiding the wire from the reel to the spool and placed outside the reel so as to be movable around the spool about the axis; a first motor and others for driving the winding arm and others to move around the spool to wind the wire on the spool; and a second motor and others for driving the reel to rotate on the axis to unreel the wire of a required length from the reel during driving of the first motor.