PROBLEM TO BE SOLVED: To prevent deformation of a threshing cylinder and improve efficiency of threshing processing.SOLUTION: A threshing cylinder is configured as follows: six threshing teeth supporting members (25) provided with threshing teeth (20) are disposed in the radial direction to a threshing cylinder shaft (26) at predetermined intervals, and disposed in the circumferential direction at predetermined intervals to each other the threshing teeth supporting members (25) are connected to a middle partition plate (38) provided in the middle section of the threshing cylinder shaft (26) six tops (30) and six sides (28) are provided in the inside of the threshing teeth supporting member (25) a drum part (27) with a cross-sectional shape formed in hexagon is provided a space (29) is formed between the drum part (27) and each threshing teeth supporting member (25) each top (30) of the drum part (27) is faced between adjacent threshing teeth supporting members (25) in the circumferential direction centering on the threshing cylinder shaft (26) and a shielding plate (45) is provided between the outer circumferential surface of the drum part (27) and each threshing teeth supporting member (25).SELECTED DRAWING: Figure 4
