| 摘要 |
PROBLEM TO BE SOLVED: To inhibit deformation of an upper frame to the utmost by a relatively simple configuration.SOLUTION: A pair of attachment parts 20 capable of being fitted with a holder HM is each formed as a notch or a through-hole elongated in a vertical direction of an upper frame 6a, and arranged in the state of sandwiching a seat-width-direction central position of the upper frame 6a. After the holder HM is attached to each of the pair of attachment parts 20, each holder HM is fixed to both of top and under surface parts 12 and 14 in a position in the rear of a seat with respect to a seating surface part 10. |
