To readily receive a grain unloading auger of a combine harvester in a prescribed housing position (a receiving part of an auger rest) even in a hillside, a soft field, etc., where the machine body is easily tilted.

The grain unloading auger is composed as follows. Brake damping is applied with an electromagnetic brake 25 when the turning of the grain unloading auger 10 is stopped on the auger rest 26 and the brake damping with the electromagnetic brake 25 is weakened when the grain unloading auger 10 is lowered and operated toward the auger rest 26. Thereby, the grain unloading auger 10 in a state of a reduced extent of turning by the own wight of the grain unloading auger 10 can readily be received in the auger rest 26 which is the prescribed housing position while being guided even in the hillside, the soft field, etc., where the machine body is easily tilted.