Seatbelt retractor attachment structure and manufacturing method of retractor bracket

A seatbelt retractor attachment structure for fixing a seatbelt retractor to a vehicle body via a retractor bracket, the seat belt retractor attachment structure comprising:

• the retractor bracket,
• wherein the retractor bracket includes:
• a fixing portion to be fixed to a retractor frame of the seatbelt retractor;
• a fastening portion to be fastened and fixed to the vehicle body;
• and
• a curved portion connecting the fixing portion and the fastening portion,
• wherein the curved portion includes a part bent from the fixing portion in a direction surrounding the seatbelt retractor and extending to a top part of the curved portion and a part folded back from the top part and extending toward the fastening portion, and the curved portion has a U shape, and
• wherein the fastening portion includes at least one of a pair of bent flange portions on both sides in a width direction of the fastening portion and a bead portion protruding along a longitudinal direction of the fastening portion.