To provide connecting hardware, not requiring an expert such as a skilled carpenter for a part requiring strength and accuracy to cope with the part in a machining factory or a job site, and securing accuracy while maintaining the strength of a joint part, although when a defect exists in the machined joint part, the strength of the joint part is not constant, which is the weak point due to nature of wood in the case of using pure wood or laminated wood as industrial product for a structural member constituting a wooden building.

A female screw plate for a cleavage preventing washer is fitted to the upside of the tip of the connecting hardware with two gaps used heretofore and a nut for fixing a cleavage preventing support washer is fitted to the central part of the lower end by welding or the like, thereby coping with a number of structural members by integration of the structural member and the connecting hardware and support function of cleavage preventing support washer, so that peripheral technology (CAD or the like) is utilized by design without large alteration of the current connecting hardware shape.