The present invention provides a combine-harvester equipped with an exhaust gas treatment device in a state where there is no limitation in the arrangement of the other devices or the disadvantages such as debris and the like accumulated on the outer surface of the other side. The combine-harvester provided by the invention comprises a prime-motion part (8) which is located on the front side of a main body (8) and which is provided with an engine (34), a grain container (6) which is located on the rear side of the prime-motion part and stores threshed grains and an exhaust gas treatment device (58) which purifies the exhaust gas of the engine (34). The exhaust gas treatment device (58) is provided below a grain tank (6) in a state of being overlapped with the grain tank (6) in a plan view. A heat shield (76) for blocking the heat of the exhaust gas treatment device (58) is arranged between the grain tank (6) and the exhaust gas treatment device (58).