An object of the invention is to make a transverse side plate 122 easily operable to be opened and closed for exposing an inner portion of a threshing device 9, in a conventional combine harvester. The conventional combine harvester of the invention is provided with a reaping device 3 which has a reaping blade 15, and the threshing device 9 which has a threshing cylinder 21 and a receiving net 24, and supplies reaped grain culms from the reaping device 3 to the threshing device 9 via a feeder house 11 and a beater 18. A grain tank 6 is arranged in laterally one side of the threshing device 9, the transverse side plate 122 rotatably opened and closed around a vertical axis 125 is provided in laterally the other side portion of the threshing device 9, and the threshing cylinder 21 and the receiving net 24 within the threshing device 9 are exposed on the basis of an opening rotation of the transverse side plate 122.
