PROBLEM TO BE SOLVED: To prevent sensitivity reduction of a manual threshing sensor which detects that an auxiliary holding rod is in a manual threshing posture.SOLUTION: A combine-harvester comprises: an auxiliary holding rod (50) which can be switched between a guide posture and a manual threshing posture； a holding rod (33) at the upper side of a feed chain； a holding rod cover (65) which is installed covering the holding rod (33) from the upper side to form a separated space over the holding rod； and a manual threshing sensor (70) which is installed inside the holding rod cover (65). A main frame (60) to which the holding rod (33), the auxiliary holding rod (50), and the manual threshing sensor (70) are attached is arranged to be vertically movable with respect to the holding rod cover (65). When being switched to the manual threshing mode by detection of the manual threshing sensor (70), rotational speed of an engine (E) becomes lower than the rated rotating speed to drive the feed chain (34).SELECTED DRAWING: Figure 9【課題】補助挟扼杆が手扱ぎ姿勢にあることを検知する手扱ぎセンサの感度の低下を防止する。【解決手段】ガイド姿勢と手扱ぎ姿勢に変更可能な補助挟扼杆（５０）と、フィードチェン上側の挟扼杆（３３）と、挟扼杆（３３）を上側から覆うように設けられ挟扼杆の上方に隔離された空間を形成する挟扼杆カバー（６５）と、挟扼杆カバー（６５）の内部に設けられた手扱ぎセンサ（７０）を備え、挟扼杆（３３）と補助挟扼杆（５０）および手扱ぎセンサ（７０）が取り付けられるメインフレーム（６０）を、挟扼杆カバー（６５）に対して上下に移動可能に設け、手扱ぎセンサ（７０）の検知によって手扱ぎモードに切り換わると、エンジン（Ｅ）の回転速度が定格回転速度よりも低速になってフィードチェン（３４）が駆動される構成とする。【選択図】図９
