Vehicle seat

A vehicle seat, comprising:

• a seat frame, comprising a seat back frame and a seat cushion frame;
• cushion material mounted on the seat frame;
• and
• skin material covering the cushion material;
• wherein:
• the seat back frame comprises a front frame that receives a load of a passenger and a rear frame spaced from the front frame to face the front frame;
• the front frame has a front portion for supporting a passenger's body, and a front frame peripheral portion extending from a periphery of the front portion toward the rear frame;
• the rear frame has a rear portion arranged at a position to face the front portion, and a rear frame peripheral portion extending from a periphery of the rear portion toward the front frame;
• the front portion and the rear portion are spaced from each other to face each other;
• both of right and left sides of the front portion comprise projection portions that are formed to expand toward the passenger;
• the front frame peripheral portion and the rear frame peripheral portion are partially overlapped with each other, fixed, and jointed at outside faces on lateral sides of the projection portions;
• the seat frame is provided with a reclining device attachment portion for attaching a reclining device to the seat frame;
• and
• at least one of the projection portions is provided with a through-hole at a position opposite to the reclining device attachment portion in an inner side face of the at least one of the projection portions.