PURPOSE: To prevent the temperature of fuel from rising by taking radiation of a fuel tank of a tractor into consideration.

CONSTITUTION: A fuel tank 14 is installed in front of a radiator 13, and an air inflow part 20 is disposed between the upper side of the fuel tank 14 and the radiator 13. Air introduced from a grille 16 collides with the fuel tank 14 and then flows to the upper side and the right and left sides, so that the fuel tank 14 is cooled by the air. Air which flows to the upper side of the fuel tank 14 is supplied to the radiator 13 through the air inflow part 20. Furthermore, as the lower part of the radiator 13 and the lower part of the fuel tank 14 closely adhere to each other, dust can be prevented from entering from the lower side of the radiator 13.