A wheel loader includes: a cooling chamber (7) in which a cooling fan and a cooling device are housed; and a grill (12) through which a cooling air obtained by the cooling fan passes. The grill (12) includes a frame (16) provided by framing four side components and a ventilation portion (17) made of a punching metal and having a plurality of air intakes, the ventilation portion (17) being provided inside the frame (16). The ventilation portion (17) is a stepwise member having a vertically arranged plurality of steps provided by plastic working of the punching metal, the ventilation portion having a three-dimensionally curved surface bulging bidirectionally toward an outside of the cooling chamber (7).