Device for indicating a possible work area in a hydraulic excavator and method for controlling the same

It is an object of the present invention to provide an apparatus for indicating a possible working range of a hydraulic excavator, which can display a suitable operability range even in an inclined orientation of the vehicle body. In the apparatus for indicating a possible working range of the hydraulic excavator a computing unit sets a limit (84) between the possible working area and the sub-floor area to the vertical direction in a global coordinate system, when the vehicle body is oriented horizontally. With an inclination of the vehicle body forward, the computing unit sets the limit (84) such that it maintains the vertical direction in the global coordinate system. With an inclination of the vehicle body backward, the computing unit, the boundary (84) between the possible work area and the underfloor region corrected angle at least 90 so that the by the boundary (84) and the ground surface (GL) on which the vehicle body is positioned, formed °.