PURPOSE: To simplify a means for positioning a bolt main frame to a bolt hole, and facilitate the operation thereof in high tensile bolt, which can fasten multiple junction members with insertion of each head part thereof to a bolt hole from one side and screw of a nut to a screw part of the one side.

CONSTITUTION: A head part 3 is provided in axial symmetrical positions of the periphery of one end of a bolt main frame 2 so as to be thinner than the outer diameter of the bolt main frame 2 and extended to the radial direction and the axial direction, and each bolt hole of multiple junction members is formed as same as the shape formed with the bolt main frame 2 and the head part 3. Movement of the bolt main frame 2 in the bolt hole is thereby prevented.