Combine harvester

Provided is a combine harvester capable of collecting dust flying from an auger of a pre-harvest processing device to a manipulation unit and discharging air of the manipulation unit heated by an engine to the outside. The pre-harvesting processing device (3) is provided with: a gathering device (3A) for gathering grain stalks and conveying the grain stalks rearward; a cutting blade device (3B) for cutting off the roots of the conveyed grain stalks; a spiral pushing device (3C) which concentrates the conveyed grain stalks to one side; a dust collection fan (40) supported by a supporting rod (50) is arranged on the upper wall of a frame body (10) of the feeding chamber (3D), and when the pre-harvesting processing device (3) is lifted to a standby position in a side view, the dust collection fan (40) is closer to the upper part than a side plate (5B) of the operation part (5), and the dust collection fan (40) is closer to the lower part than the side plate (5B) of the operation part (5) when the pre-harvesting