PURPOSE: To facilitate operation and prevent malopcration by providing right and left running operation levers on the control stand of the driver's seat of a construction machine provided with attachments for cannibalization, and controlling running only by the levers.

CONSTITUTION: A control stand 23 having a slope 29 is provided in front of a driver's seat, right and left a pair of running operation levers 24, 30 are provided side by side, and in addition, an inter boom operation lever 25, an option operation lever 31, and the like are provided therein. Operation pedals 26, 32 are used for turning a cannibalizer, opening/closing a cannibalizer, and the like. Right and left running operations are controlled only by the levers 24, 30, and in response to addition of control devices due to increase of function of attachments, actuators corresponding to respective operation levers except the running levers 24, 30 are made possible to be selected and changed over. Hereby, operation is facilitated, maloperation is eliminated, and hence safety can be improved.