PURPOSE: To use a rear pipe also as a kickstand by fitting the rear pipe to a main pipe in such a manner as to freely turn up and down, and grounding a connecting part of the rear pipe to a seat rail pipe when the rear pipe is turned downward.

CONSTITUTION: At the time of functioning a right rear pipe 4rr as a kickstand, the screw-engagement of the respective fixing bolts 22, 14 and a nut 16 respectively positioned on the free end side of the right rear pipe 4rr and the base end 8 side is released. The fixing bolt 14 is removed from a fixing through hole 9b1 of an inclined part 9b in a clamping plate 9, and the right rear pipe 4rr is supported in such a manner as to freely turn only by a base end bolt 10 and a nut 12. After that, the right rear pipe 4rr is oscillated downward on the base end bolt 10, the fixing through hole 9b1 is aligned with a fixing through hole 9a1 of a fixing part 9a in the clamping plate 9, and the fixing bolt 14 is passed through the above holes and fixed by the nut 16. Thus, the right rear pipe 4rr is fixed in a designated place under a wheel and positioned.