To easily move from a ridge to the next ridge with turning of an angle of 180° at the end of the ridge for farm machinery supported by front two wheels 4 and rear two wheels 3 striding the ridge and operated/run by holding a steering handle bar 5 extending backward.

The front wheels 4 are vertically moved by a hydraulic cylinder 10 for lifting interlocking with the rear wheels 3 to vertically move a traveling machine body 1 while a lifting arm 16 for supporting the front wheels 4 is largely drawn upward by a hydraulic cylinder 21 for drawing upward 1 and thereby the machine is run only by the rear two-wheels.