A first end portion of a connecting part of a connecting member reaches a locked member arranged such that the thickness direction of one of two construction materials is an axial direction N, and a second end portion of the connecting part reaches the other one of the two construction materials. The second end portion is formed to have a torsion angle α as an inclination angle to the axial direction N. When the second end portion is coupled with the other construction material by a coupling fitting, the torsion angle α reduces or disappears, a torsion angle to the axial direction N is generated in the first end portion, the first end portion locks on the locked member, and the connecting member connects the two construction materials.