The utility model provides a threshing device which can avoid deformation of a barrel portion of a threshing cylinder and maintain high threshing performance. The threshing cylinder (11) is provided with a front bearing component (13), a rear bearing component (15), a middle bearing component (14) and plates (60), wherein the front bearing component (13) enables the front end of a barrel body (61) to be supported on the front portion of a threshing cylinder shaft (12), the rear bearing component (15) enables the rear end of the barrel body (61) to be supported on the rear portion of the threshing cylinder shaft (12), and the plates (60) are provided with a plurality of threshing teeth (60A) arranged in the axial direction of the threshing cylinder shaft (12) at intervals in a separated mode. A plurality of plates (60) are circumferentially arranged on the periphery of the barrel body (61) in a separated mode, and accordingly the problem is solved.本發明提供脫粒裝置，其能夠防止脫粒滾筒的筒部的變形並維持高的脫粒性能。脫粒滾筒(11)具備：將筒體(61)的前端部支承於脫粒滾筒軸(12)的前部的前部支承構件(13)；將筒體(61)的後端部支承於脫粒滾筒軸(12)的後部的後部支承構件(15)；以及將筒體(61)的前後方向中間部支承於脫粒滾筒軸(12)的中間部支承構件(14)，將該中間部支承構件(14)配置於比筒體(61)中前後方向中央部偏向前側的部位，由此解決了上述課題。
