A reel device for a flat cable through which electrical component parts mounted on a steering wheel are electrically connected with electrical component parts on a vehicle body side. The reel device is disposed between the steering wheel and a combination switch mounted on the vehicle body side and comprises a generally cylindrical frame section inside which a shaft section is disposed rotatable relative to the frame section. The frame section is fixed to the combination switch, whereas the shaft section is fixedly mounted around the steering shaft. The flat cable is movably disposed in an annular cable storing space formed between the frame section and the shaft section. A generally annular guide member is movably disposed in the cable storing space and located between the cable wound on the outer peripheral surface of the shaft section and the cable wound on the inner peripheral surface of the frame section. The guide member is formed with a slit through which the flat cable extending between inside and outside of the guide member is passed upon being turned over. At least one linear projections are formed on at least the inner peripheral surface of the guide member so as to be slidably contactable with the cable thereby to reduce a frictional resistance of the flat cable to the guide member.