To improve sorting performance of clean grains and to reduce tailings and to lower a load on a threshing apparatus.

The threshing apparatus is equipped with a threshing cylinder 31 axially supported so as to be rotative in a threshing chamber 33 and receives a material to be processed, leaked down from a threshing net 30 at the lower part of the threshing chamber 33, by a shaking separation shelf 38 and shakes and separates the material while shaking and transporting it. The threshing apparatus is equipped with a winnower 43, a clean grain screw 46, a tailings screw 47 from the upstream side in the separation air flow direction below the shaking separation shelf 38. An upper shelf tip 54 is provided above the clean grain shelf tip 53 of the clean grain screw 46, a front filtration body 56 is provided below the chaff sieve 38b of the shaking separation shelf 38, a rear filtration body 55 is provided at the rear of the upper shelf tip 54 and the upper shelf tip 54 and the rear filtration body 55 are provided above the tailings screw 47.