PROBLEM TO BE SOLVED: To obtain a working simulation apparatus, along with a numerical control device, capable of determining a working failure or facilitating estimation of the occurrence factor of the working failure.
SOLUTION: The working simulation apparatus includes: a machining simulator 3 for simulating the shape of a workpiece expressed by a distance field model; a comparison object selection unit 4 for selecting a comparison object shape from among the simulation result; a shape rendering processing unit 5 for performing rendering processing for displaying the simulation result with graphics; and a simulation execution control unit 2. By assuming, in the rendering processing, a projection face on which pixels are arrayed, a light beam following a projecting direction as a direction which is vertical to the projection face from each of the pixels on the projection face, the intersection position of a comparison object shape and the light beam, a shape rendering processing unit 5 determines the luminance value of each of the pixels based on a distance value with code for a reference standard shape and a difference between secondary geometrical featured values which can be derived from a distance field, at the intersection position.
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