To improve cooling efficiency of an oil cooler by arranging the oil cooler with almost the same intake area as a radiator, at the front face of the radiator, and closing a clearance between the peripheral part of the oil cooler and an intake box with a shielding plate.

An outside air intake box 12 provided with a dust-proof net 11 detachable from the outsdie of a machine body is provided above an engine 10 of a driving part 4 of a all-culm charging type combine, and a radiator 13 is disposed on the machine body inner side of the intake box 12. A cooling fan 15 driven by a hydraulic motor 14 is provided behind the radiator 13, and a muffler 16 and an exhaust pipe 17 are disposed in an air duct downstream of the cooling fan 15. An oil cooler 18 for cooling operating oil of a cooling fan driving hydraulic motor 14 or the like is installed in the intake box, but a shielding plate 27 for closing a clearance between the peripheral part of the oil cooler 18 and the intake box 12 is provided on the front face side of the oil cooler 18, that is, on the intake upper reaches side, so as to make all of radiator cooling air pass through the oil cooler 18.