An operation part is easy in moving toward a position away from the external side of engine for a specified distance, so that the upper side of engine and the periphery thereof are opened to a large extent for increasing the maintenance efficiency. A husker (3) and a grain storage device (5) are juxtaposed on the left and right sides of upper side of a machine frame (1) equipped with a travelling device (2). A mowing device (4) is installed on the front side of machine frame (1). An engine (11) and a link mechanism (15) are installed on a part on the machine frame (1) between the mowing device (4) and the grain storage device (5). The link mechanism (15) supports an operation part (6) equipped with a seat (7) into a state transversely freely movable between a position covering the upper side of engine (11) and a position away from the outside of engine (11) for a specified distance while maintaining a longitudinal gesture state without interfering the mowing device (4) located on the front side of operation part (6) and the grain storage device (5) located on the rear side of operation part (6).使操縱部容易往比引擎往外側方離開設定距離之位置移動，將引擎之上側及其周邊大幅開放以提高維護效率。；於具備行進裝置(2)之機體架(1)之上側左右並列設置脫殼裝置(3)與穀粒貯藏裝置(5)，於機體架(1)之前側設置收割裝置(4)，於該收割裝置(4)與穀粒貯藏裝置(5)之間之機體架(1)上之部位設置引擎(11)，並設有連桿機構(15)，此連桿機構(15)將具備座席(7)之操縱部(6)支撐為在不致干涉位於該操縱部(6)前側之收割裝置(4)及位於該操縱部(6)後側之穀粒貯藏裝置(5)之情形下，在維持縱姿勢之狀態下，從覆蓋引擎(11)上側之位置、往位於該引擎(11)外側方且相距一設定距離之位置自由橫移動。
