The sliding roof portion of a motor vehicle is connected to two shoes, each of which is made of synthetic resin and slidably fitted in a guide groove of the lateral rail of the fixed portion of the vehicle roof. Two toothed coils are provided to be driven by a driving toothed wheel interposed between each of the coils in axially opposite directions. The connection between the toothed coil and the shoe is completed simultaneously with the insert formation or molding of the shoe so that the coil may be secured to the shoe.