| 摘要 |
PROBLEM TO BE SOLVED: To improve the rigidity of an upper part of a plate-like frame where a cross direction width of an upper part is narrower than that of a lower part.SOLUTION: Each of left and right side frames 21 constituting a seat back frame includes a plate-like frame (a main side frame 21) having a side wall part 21A where a cross direction width of an upper part A2 is narrower than that of a lower part A1. A rear side flange part 21C which bends to the inner side in a crosswise direction is formed at a rear end part of the side wall part 21A. A forward protruding part 21D protruding forward is formed at a portion of the rear side flange part 21C which corresponds to the upper part A2. |
