PURPOSE: To eliminate dusts of outside air without a large setting space by providing an intake port of air between a fuel tank and a tank attaching base, and by housing a filter element in an agricultural machine.

CONSTITUTION: Inside an engine room 1, a tank attaching base 3 is set at the upper position of an engine 2, and a fuel tank which has a space 4 is arranged. In the space 4, a filter element 10 is contained, and an air cleaner 6 is formed. Consequently, the dusts of outside air without a large setting space is eliminated. As a general filter element can be used, cost down is attained.