A reel body (2a) of a spinning reel includes: a body member (20) having an opening on a side portion thereof; a lid member (21) screwed to the body member so as to close the opening of the side portion of the body member; a cover member (23) attached along the outer shape of the rear of the body member (20) and the lid member (21); a nut member (25); and a screw member (71). The body member has a recessed portion (20a) and a bore portion (20b) formed such that surfaces defining the recessed portion and the bore portion open out. The recessed portion (20a) and the bore portion (20b) are connected. The nut member (25) is non-rotatably coupled to the recessed portion (20a). The screw member (71) is coupled to the bore portion (20b) to be inserted into the nut member (25). The present invention provides a simple and inexpensive fastening structure. <IMAGE>