To provide a combine harvester in which the rotation operation of a steering operation tool has priority to the operation of a route-changing means to change the route, even the route-changing means is wrongly operated during the rotation operation of the steering operation tool, thus improving the operability of the combine harvester.

In this combine harvester, when a route-changing means (16) is rotated in either of right and left direction in a prescribed quantity, a hydraulic continuously variable transmission (40) for revolution is operated to reduce the rotation rate of a wheel shaft (30), thus revolving the combine harvester. When the route-changing means 16 is further rotated, the right and left wheel shafts (30, 30) are mutually conversely rotated by the rotation output of the hydraulic continuously variable transmission (40), thus spin-revolving the combine harvester. When hands are separated from the route-changing means (16), the rotation output of the hydraulic continuously variable transmission (40) is stopped to straightly drive the combine harvester. In addition, even when a route-changing means (17) is operated during the revolution operation of the route-changing means (16), the route-changing means (16) is preferentially operated to change the route.