Patent ID: 8037962

Claim:
A motorcycle comprising: a main frame including an up-and-down extension part arranged to extend in an up-and-down direction of the motorcycle at a widthwise center of the motorcycle; side plates disposed apart from each other on a right side and a left side of the up-and-down extension part; and a plurality of supporting pipes fixed to the up-and-down extension part and arranged to extend in a widthwise direction of the motorcycle; wherein the side plates are attached to each of a left side and a right side of at least one of the plurality of supporting pipes; the plurality of supporting pipes are welded to an outer surface of the up-and-down extension part; the up-and-down extension part includes a substantially rectangular pipe arranged to extend in the up-and-down direction of the motorcycle; flat side surfaces of the substantially rectangular pipe face a fore-and-aft direction of the motorcycle; and the at least one of the plurality of supporting pipes is joined to a front surface or a rear surface of the up-and-down extension part.