As for this invention, whether or not suffering installation ones which are installed in the machine tool and 3 dimensional model data which at least includes the portion of the machine tool is accurate, at the same time easy it regards 3 dimensional model data validation device and the like which efficiently, furthermore precision can verify well. As for 3 dimensional model data validation device (1), the machine tool (30) image pickup doing actual suffering installation ones which are installed, the CCD camera which forms the actual graphics data of suffering installation ones (13,14) with, the machine tool (30) suffering installation ones which are installed and at least the machine tool (30) the model data memory section which remembers those which were beforehand drawn up with the model data which includes part (17) with, with computer processing, the model data memory section (17) the imagination graphics data formation which forms the hypothetical graphics data barrel 2 dimensional graphics data of suffering installation ones on the basis of the model data which is housedThe section (19) with, with computer processing, comparing with the actual graphics data and the hypothetical graphics data of suffering installation ones, the graphics data relative section which it judges whether or not these agree, (21) with it has.
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