PROBLEM TO BE SOLVED: To arrange a throttle lever and a main gear lever in a steering unit of a combine harvester compactly. SOLUTION: A side operation panel frame (21) on the left hand of a seat (3a) is configured to join unevenly a front frame (21a) and a backside frame (21b) such that the front frame (21a) which forms the front part thereof is placed at lower and the backside frame (21b) which forms the rear part thereof is placed at higher, wherein a throttle unit (23) for regulating the engine rotation number is attached to the front frame (21a), whereas the throttle unit (23) includes a first throttle gear (23a) supported rotatably around an axis (23p), a throttle lever (23b) which is attached to the first throttle gear (23a) to turn integratedly around the axis (23p), and a throttle regulation motor (M1) which carries out forward and reverse drive of the first throttle gear (23a). COPYRIGHT: (C)2013,JPO&INPIT
