To sufficiently ensure a tank capacity of a fuel tank and to easily perform layout design of a battery.

An engine 20 is suspended/mounted to a main pipe 10. Further, the fuel tank 30 is arranged at a rear side of the engine 20. Further, an air cleaner 70 is fixed to an intermediate pipe 11 of the main pipe 10 above the engine 20. Then, the battery 80 is fixed to the intermediate pipe 11 of the main pipe 10 at a position between the fuel tank 30 and the air cleaner 70.