The invention discloses a harvester which is provided with an operation linkage mechanism for transmitting swing operation of an operation lever (13) to a steering driving part and a lifting driving part. The operation linkage mechanism is provided with a steering means for linking the operation lever (13) and the steering drive unit, and a raising/lowering means for linking the operation lever (13) and the raising/lowering drive unit. Each means is provided with an output operation body (71) for transmitting the swing operation of the operation lever (13) to the steering drive unit/raising/lowering drive unit. Within a preset movable range of the steering drive unit and the raising/lowering drive unit, the output operation body (71) integrally moves in accordance with the swing operationof the operation lever (13). When the operation lever (13) is operated in a direction in which the steering drive unit/raising/lowering drive unit is moved away from the movable range after the steering drive unit/raising/lowering drive unit has reached the operation limit of the movable range, the output operation body (71) does not integrally follow the operation lever (13) any more and allows the operation lever (13) to perform a swing operation alone.