To provide a thresher capable of improving maintainability of a threshing cylinder.SOLUTION: A thresher 9 includes a threshing cylinder 12 provided in a threshing chamber, a threshing cylinder frame supporting the threshing cylinder 12, and vertically rockable around a longitudinal axis Y2, an openable/closable threshing chamber cover 71 for covering the threshing cylinder 12 and the threshing cylinder frame from above, and a retention mechanism 76 for retaining the threshing chamber cover 71 in the opened state, in the state where the threshing cylinder frame is positioned on an elevated position.SELECTED DRAWING: Figure 9【課題】扱胴のメンテナンス性を向上させることが可能な脱穀装置が要望されている【解決手段】脱穀装置９に、扱室に設けられる扱胴１２と、扱胴１２を支持すると共に前後向き軸心Ｙ２周りで上下揺動可能な扱胴フレームと、扱胴１２及び扱胴フレームを上方から覆う開閉可能な扱室カバー７１と、扱胴フレームが上昇位置に位置する状態で、扱室カバー７１を開いた状態に保持する保持機構７６と、が備えられている。【選択図】図９
