An external reference 80 is provided to extend horizontally in the direction of advance of a target slope face. A vertical distance hry and a horizontal distance hrx from the external reference to a reference point on a target slope face, and an angle &thetas;r of the target slope face are set by using a setting device 7. When a front reference 70 provided at a bucket end is aligned with the external reference and an external reference setting switch 71 is depressed, a control unit 7 calculates the vertical distance hfy and the horizontal distance hfx from the body center O to the external reference, then calculates the vertical distance hsy and the horizontal distance hsx from the body center O to the reference point of the target slope face by using the distances hsy and hsx as modification values, and then sets the target slope face on the basis of a body 1B from the distances hsy and hsx and the angle input by the setting device, thereby carrying out area limiting excavation control. A slope extending continuously without steps can be thereby formed by excavation even when the positional relationship between the body and the finished slope is changed upon movement of the body in the lateral direction. IMAGE
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