An optical three-dimensional structure measuring device including: optical three-dimensional structure information storing device (91) for storing optical three-dimensional structure information； specific layer extracting device (121) for comparing information values of the optical three-dimensional structure information stored in the optical three-dimensional structure information storing device with a predetermined threshold and extracting, as a specific layer area of the measurement target, an area equal to or greater than a predetermined range where the information values of the optical three-dimensional structure information equal to or greater than the predetermined threshold continue； missing area extracting device (122) for extracting, as missing areas, areas where the information values of the optical three-dimensional structure information are smaller than the predetermined threshold in the specific layer area； missing area range calculating device (123) for calculating sizes of ranges of the missing areas； and region-of-interest classifying device (124) for comparing the sizes of the ranges of the missing areas with a plurality of predetermined range determination reference values and classifying the missing areas into a plurality of types of regions of interest.
