PURPOSE: To connect wooden members without misalignment and loosening between them and without causing damage to a bolt part by forming a connecting bolt consisting of a wood screw part and a bolt part, and a washer of the same curvature as a seat part combined to the connecting bolt into a one body with a nut, and providing a flat part between the wood screw part and the bolt part as a driving part.

CONSTITUTION: Between a wood screw part 2 and a bolt part 3, a flat part 6 which is held by a tool when the wood screw part is screwed into a wooden member, is provided, and a nut 5 and a washer 4 of the same curvature and shape as the curvature of a seat part of a mounting hole of the nut, are combined to a connecting bolt 1. Thus, when the wood screw part 2 is screwed into the wooden member, the bolt part 3 is not damaged, and misalignment and loosening between the wooden members can be prevented.