An accessory that needs to be protected against water is located in a water-coverable area with waterproofness being provided with certainty, while the number of components is suppressed from increasing. An accessory provided with a metal casing or including a female connector is provided in a water-coverable area of an automobile including a retractable roof. A cover covering the accessory is provided. The cover includes a plurality of panels and a plurality of hinges and is foldable upward. A harness supporting bracket supporting a wire harness has a pressing function of pressing the cover such that the cover is not foldable.