PROBLEM TO BE SOLVED: To provide a combine harvester cleaning exhaust gas by disposing a DPF (Diesel Particulate Filter) at a position immediately back of an engine between a threshing part and a lower part of a tank inclined bottom wall of a grain tank and removing particulate matters in the exhaust gas by the DPF.SOLUTION: The combine harvester comprises: a threshing part and an operation part at the back of a pretreatment part in a left side and a right side of a traveling machine base respectively an engine 11 surrounded by an engine cover a grain lifting cylinder including a grain lifting spiral body that supplies a grain tank with grains threshed and selected by the threshing part and the grain tank. When a DPF 26 for removing particulate matters contained in exhaust gas is disposed in a space part formed at an immediately back of the engine 11 between the threshing part and a lower part of a tank inclined bottom wall of the grain tank, an exhaust pipe 30 to be connected to the DPF 26 is inserted into a left inclined side wall constituting a cover body 27, and is bent and extended upward such that the exhaust pipe is positioned along the grain lifting cylinder, with it brought closer to or brought into contact with the outer periphery thereof, and an exhaust port of the exhaust pipe 30 is provided to be opened rearward near the upper part of the grain lifting cylinder.
