Combine harvester

The invention provides a combine harvester which does not accumulate foreign matters in the internal space of a cover part. The combine harvester is provided with a threshing device (6), the threshing device (6) is used for receiving crops harvested by a harvesting part and threshing the received crops, and the threshing device (6) is provided with a threshing cylinder (12) which is rotated to thresh the crops and a threshing chamber which accommodates the threshing cylinder (12). The front and rear ends of the supporting shaft of the threshing cylinder (12) penetrate through the front and rear walls of the threshing device (6), and the portion of the supporting shaft protruding out of the device than the walls is provided with driving parts (43, 44) for inputting power to the threshing cylinder (12). A cover part (45) attached to the walls in a state of covering the drive parts (43, 44). The lower part of the cover part (45) is provided with an opening part (60), and the opening part (60) allows foreign matt