PROBLEM TO BE SOLVED: To enlarge adaptability to a crop.SOLUTION: A grating net 13 includes: plural vertical bars 20, 21 formed of a circular plate member along a circumferential direction of a threshing cylinder 12 and juxtaposed in an axial direction of the threshing cylinder 12; and plural horizontal bars 22, 23 formed of a rod member along the axial direction of the threshing cylinder 12 and juxtaposed in the circumferential direction of the threshing cylinder 12. The horizontal bars 22, 23 include: plural welded horizontal bars 22 welded and fixed; and plural attachable/detachable horizontal bars 23 detachably attached between the adjacent welded horizontal bars 22.SELECTED DRAWING: Figure 4