To enable the close arrangement of right and left cooling fans that are common to each other and rotate in the same direction. A radiator is disposed forward of an engine, is horizontally lengthwise and is formed such that the center thereof bends to protrude rearward. A pair of right and left cooling fans is provided on the rear surface of the radiator. The left and right cooling fans have the same specifications, rotating in the same direction. A support plate is provided to surround the cooling fans, that is, to close left and right sides of, the upper side of and the rear of the cooling fans and open the lower side thereof. A partition portion is formed to project from the center of a rear wall to partition between the left and right cooling fans. Thus, the adjacent cooling fans can be prevented from interfering with each other and can be arranged close to each other.