WORKING MACHINE

PROBLEM TO BE SOLVED: To provide a working machine omitting the waste of energy and stabilizing the position of a ground working device by providing a correcting means setting a control form for suppressing control operation on the side of high frequency so as to reduce the frequency of control operation. SOLUTION: This machine is provided with a control means 46 maintaining the ground working device provided for a machine body to be in a desired working state set in advance, and a correcting means E setting a control form so as to suppress control operation on the side of high frequency based on frequency in the controlling direction of this means 46. In addition, it is desirable that the control means 46 consists of a processing system maintaining a previously set target ground height based on the measuring result of a ground type sensor 11 provided for the ground working device and that the means E consists of a processing system extending the width of a non-sensing belt where the ground working device is formed by the reference of the target ground height toward a high ratio side from the ratio of control to a rising side and control to a lowering side within a unit time.