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PROBLEM TO BE SOLVED : ridge raised from digging into the farm, by a driving wheel of the traveling machine body, unnecessary, so that the ridge is pushed into the fitting without digging up the ground growing crops. SOLUTION : and a traveling machine body, attached to a rear side of the left and right driving mechanism having a mounting plate and a crop and digging up mechanism. On the left and right of the rear excavator respectively for mounting the mechanism on the inside surfaces of the plate, the left and right of the rectangular plate for preventing the fall of the farm, in their upper part, between 1 and 2 in a first rotational position of the second rotatably mounted to, going from the top to the bottom, right and left side plates respectively mounted on mechanism for digging is extended and curved, 1 takes the second state in which the turning position of the, top surface of the ridge in crop on moat closely facing state is extended in the longitudinal direction, the second turning position 2 in a state where the, spaced apart from the top surface of the ridge extends in a state having an end face. Selected drawing : fig. 1