To solve a problem wherein a screw hole is broken if a screw is fastened too tightly by using a screw and a screw driver of different sizes when a conventional phillips screwdriver is used for a conventional phillips screw.

This invention relates to a new screw and a new screwdriver to replace screws and screwdrivers which are currently spread and is used as general-purpose articles. A multipurpose screw and a multipurpose screwdriver not causing break during tightening and loosening are devised with paying attention to facts that conventional screws are easily weathered and that G applied on the screw by a man in tightening and loosening varies in strength. Problems that the screw cannot be attached to the broken screw hole and that the screw cannot be loosened after attachment are solved by eliminating non-contact part of connecting surfaces the screw hole and the tip of the screwdriver.