Combine harvester

The invention provides a combine harvester which can effectively and flexibly use the space of a machine body, can be compactly provided with an exhaust gas purification device, and can obtain excellent weight balance. A combine harvester in which an engine (11) is disposed in the front of a traveling machine body, and a threshing unit and a grain storage unit are disposed on the traveling machine body in a left-right lateral arrangement, the combine harvester being provided with an exhaust gas purification device (30) having: a DPF housing (31) for removing particulate matter from the exhaust gas of the engine (11); and an SCR housing 32 that removes nitrogen oxides in the exhaust gas of the engine 11. The DPF housing 31 and the SCR housing 32 are disposed behind a driving unit disposed above the engine 11 and on the left and right inner sides of the threshing unit in a state in which the DPF housing 31 and the SCR housing 32 are arranged up and down with the longitudinal direction thereof being oriented in