To make cooperation on operation of a main shift lever and an auxiliary control lever good and to simplify a step for arranging these levers on an operation part.

In the main shift lever 31, its free end is arranged such that it is overlapped on a right side rear wheel fender 12R in plan view. The main shift lever 31 and the auxiliary control lever 34 are pivotally supported on a bracket 40 mounted to the rear wheel fender 12R in such a state that it is adjacent to each other in a longitudinal direction of a vehicle body along a driver's seat 21.