The subject of the present invention is to enhance the durability of the pipes at the exhaust inflow side of the exhaust gas purifier with less occurrence of metal fatigue, and to make the high temperature exhaust gas exhausted from the upper end of the exhaust pipe not flow toward the rice husks accumulated at the lower portion of the machine body. The solution of the present invention is to configure an inclined wall (23B) at the bottom of the grain tank (6) which is upwardly inclined toward the thrashing device (5)； configuring the exhaust purifier (40) for removing granular substances from the exhaust gas in the engine (9) at the lower space of the inclined wall (23B)； connecting the inlet of the exhaust purifier (40) with the exhaust manifold (30B) of the engine (9) through a flexible connection pipe (50)； connecting the outlet of the exhaust purifier (40) with the lower end of the exhaust pipe (61) for guiding the gas exhausted from the outlet out of the machine； and configuring the exhaust pipe (61) upwardly extending along the winnowing device (14).
