To provide a roofing structure that can show certainly sufficient sealability over a longer period of time compared with the conventional ones in a combination body of a resin packing and screws having sealability combined on the screw for tightening a roof material.

When fastening the roofing materials by using the combination body of the resin packing and the screws having sealability, the stability of the quality of the resin packing can be improved by providing projections for preventing any mingling of air bubbles to a main body of the body portion of the resin packing when producing. A boss portion is made in a peripheral portion of a through hole provided on the resin packing, and the resin packing is combined with a screw having a recess on a bottom surface of its head portion. In this way, a sufficient water sealing effect can be given certainly for a long period of time to a screw inserting hole arranged in components to be secured.