PURPOSE: To prevent a cable from being damaged while securing the capacity of an air cleaner by accommodating a part of a cable body, laid from the front to the rear of a vehicle body, into a recessed part formed along the bottom part of the air cleaner.

CONSTITUTION: At the bottom part 10a of an air cleaner 10, a recessed part 10b for laying/accommodating a part of a main harness 1 is formed along the proceeding direction of a vehicle. The main harness 1 is laid behind a vehicle body, along the inner side of a tank rail 4, and a part of the main harness 1 is accommodated into the recessed part 10b formed along the bottom part 10a of the air cleaner 10 at the time of passing through the air cleaner 10. The large capacity of the air cleaner 10 can be thereby secured, and the damage generated to the main harness 1 is reduced considerably as well as external appearance is improved since a part of the main harness 1 is not exposed from the body side part.