To perform an interference avoiding control controlling a bucket 6 so that its tip does not interfere with an obstacle by using a navigation system 11 in the frame body 1 of a hydraulic shovel in not only the vertical displacement of the tip position of the bucket 6 but also in the turning of an upper structurer.

The coordinate of the tip position of the bucket is calculate by using the present position of the frame body 1, the orientation of the upper structure 3, and the detected rotating angle values of a boom 4, an arm 5, and the bucket 6. When the calculated coordinate comes within a preset interference avoidance range, the moving speeds of the tip part of the bucket in vertical and horizontal directions are reduced and, when it moves by a preset distance from the obstacle, the bucket is controllably stopped.