PROBLEM TO BE SOLVED: To solve the problem wherein cooling efficiency of a cooling fan is deteriorated due to abrasion of a belt for rotating the cooling fan and because of not changing the rotating speed of the cooling fan.SOLUTION: This combine harvester includes: a traveling device 2 a reaping device 4 a grain tank 5 and a cabin 12. The cabin 12 is opened to an open position projected over a machine body frame 1. A continuously variable transmission 33 for the fan, which drives the cooling fan 28 for cooling an engine 11, is freely switched between the cooling state where the fan is driven in the normal direction and a dust removing state where the fan is driven in the reverse direction. The continuously variable transmission 33 for the fan is disposed outside the track of rotation of the cooling fan 28 as viewed in the shaft center direction of the cooling fan 28 and also between an open arm 16 of the link mechanism 15 and the upside of the engine 11.
