Fastening structure

A fastening structure for fastening a member to be fastened to a target member by use of a fastening bolt and a nut, the fastening structure comprising:

• the member to be fastened;
• the target member;
• the fastening bolt;
• and
• the nut, wherein
• the member to be fastened has a first fastening hole that penetrates in a prescribed axial direction so as to allow the fastening bolt to be inserted,
• the target member has a second fastening hole that penetrates in the axial direction so as to allow the fastening bolt to be inserted, and a nut pocket that communicates with the second fastening hole, and has an open end in a first direction substantially orthogonal to the axial direction and directing upward,
• the member to be fastened is fastened to the target member by insertion of the fastening bolt into the first and second fastening holes, and screwing and tightening of the nut housed in the nut pocket,
• at least one of a distal end part of a male screw part of the fastening bolt, and a proximal end part of a female screw part of the nut are formed with a tapered surface that guides the nut to a coaxial position with the fastening bolt,
• the nut pocket is formed with:
• a rotation restricting part that restricts rotation of the nut around the axis while allowing movement of the nut in the first direction by engagement with a part of the nut;
• and
• an abutting surface that is an abutting surface which abuts on another part of the nut, and is a gradient surface which proceeds in the axial direction as well as in the first direction, and
• the nut is formed with:
• a female screw part that is screwed with the fastening bolt;
• a restricted part that engages with the rotation restricting part;
• and
• a surface to be abutted that abuts on the abutting surface, and is a gradient surface substantially parallel to the abutting surface.