| 摘要 |
PROBLEM TO BE SOLVED: To simplify structure for reducing an impact at the time of collision. SOLUTION: A plurality of mounting holes 7 and 8 which mount external members are formed on a left and right side frames 3 made of a thin steel sheet, and the side frames 3 and the external members are tightened by means of tightening members 11 and 12 which are mounted in each of the mounting holes 7 and 8. The tightening member 11 is a member which can contact with the hole edge of the mounting hole, and this tightening member 11 is mounted in all of the holes on the left and right side frames 3 or all of the holes other than one hole thereon, as a result, the impact at the time of collision is reduced.
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