PROBLEM TO BE SOLVED: To provide a combine capable of suppressing ridges such as shredded straw and discharge to the uncut grain culm side. SOLUTION: A threshing processing device (10) for shredding straw after threshing is provided on the rear side of the threshing device (3), and extends in the front-rear direction at the lower part of the left wall of the straw processing device (10). An existing left rotation shaft (11) is provided with a left guide plate (12) supporting the upper part thereof, and a lower part of the right wall of the straw processing device (10) is provided with an upper part on the right rotation shaft (21) extending in the front-rear direction. When the combiner is determined to be traveling in the vicinity of the ridge by the controller (40) which receives the GPS reception signal and is provided with the right guide plate (22) supporting the Rotate the left rotation shaft (11) counterclockwise to change the posture of the left guide plate (12) to a neutral posture that hangs from the left rotation shaft (11), and rotate the right rotation shaft (21) clockwise. Thus, the right guide plate (22) is configured to change its posture to a left downward inclined posture. [Selection diagram] Fig. 9【課題】細断された排藁等の畦や未刈穀稈側への排出を抑制することができるコンバインを提供する。【解決手段】脱穀装置(3)の後側に脱穀後の排藁を細断する排藁処理装置(10)を設け、排藁処理装置(10)の左壁の下部に、前後方向に延在する左回転軸(11)に上部を支持した左案内板(12)を設け、排藁処理装置(10)の右壁の下部に、前後方向に延在する右回転軸(21)に上部を支持した右案内板(22)を設け、GPSの受信信号が入力されるコントローラ(40)によって、コンバインが畦の近傍を走行している状態と判定された場合には、機体背面視において、左回転軸(11)を反時計方向に回転させて、左案内板(12)を左回転軸(11)から垂下する中立姿勢に姿勢変更し、右回転軸(21)を時計方向に回転させて、右案内板(22)を左下がり傾斜姿勢に姿勢変更させる構成とした。【選択図】図9