| 摘要 |
PROBLEM TO BE SOLVED: To support larger force applied on a rear part of a seat rail by reinforcing even the rear part of the seat rail by connecting subsidiary pipes to a rear end part of the seat rail as well as to a middle part of the seat rail as in a conventional structure where the middle part of the seat rail only is supported by the subsidiary pipes. SOLUTION: A pair of a right and a left subsidiary pipes 31 and 31 are extended rearward and diagonally upward from subsidiary pipe installation parts 12c and 12c under seat rail installation parts 12b and 12b of main frames 12 and 12. Middle parts of the subsidiary pipes 31 and 31 are connected to the middle part of the seat rail 28 through a cross pipe 113. An installation pipe part 111 as a rear end part of the subsidiary pipes is also connected to the rear end part 116 of the seat rail 28.
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