Vehicle body fastener structure

A vehicle body fastener structure comprising:

• a vehicle body frame disposed on a vehicle body;
• a sub-frame including an attachment portion attached to the vehicle body frame;
• a welding pipe nut coupled to the vehicle body frame;
• and
• a bolt fastening the attachment portion of the sub-frame to the welding pipe nut, wherein
• the welding pipe nut comprises
• a pipe inserted through the vehicle body frame from an outside and having a female thread, and
• a coupling flange provided at a base of the pipe and coupled to an outer surface of the vehicle body frame,
• the attachment portion of the sub-frame is fastened to the welding pipe nut with the bolt threaded into the female thread,
• the coupling flange is coupled to the outer surface of the vehicle body frame by spot welding,
• a boss protrudes from a surface of the coupling flange facing the pipe across the coupling flange,
• a seat surface is provided on an end surface of the boss, and
• the attachment portion of the sub-frame abuts against the seat surface and is fastened with the bolt.