PURPOSE: To provide a working mobile vehicle having a simplified structure and enabling the improvement of accuracy and stability of an automatic rolling control by placing a control speed-adjusting means for adjusting the controlling speed for an automatic rolling control in a rolling-controlling device.

CONSTITUTION: This working mobile vehicle is provided with a control speed- adjusting means for adjusting a control speed of an automatic rolling control depending on a position of a vertical motion-controlling device such as a hydraulic pressure sensitivity-adjusting lever 7 in a rolling-controlling device. Further, the control speed-adjusting means is preferably shifted to a high speed side in terms of the controlling speed of the automatic rolling control when the vertical motion control-adjusting device is located at a soft place in a field and on the other hand to a low speed side when located at a harder place.