PROBLEM TO BE SOLVED: To provide a threshing cylinder that can be reduced in weight of the threshing cylinder by miniaturization of a partition plate and can be reduced in cost.SOLUTION: A threshing cylinder includes: a threshing cylinder shaft 11 a front support plate provided at the front end side of the threshing cylinder shaft 11 a rear support plate provided at the rear end side of the threshing cylinder shaft 11 a plurality of circle pipes 14 with the front end supported by the front support plate and with the rear end supported by the rear support plate, and disposed on the circumference centering on the threshing cylinder shaft 11 a plurality of threshing teeth 15 plurally provided at each of the plurality of circle pipes 14 and a substantially circle-shaped partition plate 16 provided between the front support plate and the rear support plate in the threshing cylinder shaft 11, and supporting between the front end and the rear end of the plurality of circle pipes 14. The diameter of the partition plate 16 is smaller than that of a rotary locus L of a portion which is the nearest to the threshing cylinder shaft 11 in the cross sections of the circle pipes 14.
