A metallic pseudo-tire imitating a tire is created and used as a master disk. An uneven plate is attached to the sidewall surface of the master disk. The uneven plate is provided with a base surface, protruding surface, and recessed surface. A mask processing unit uses mask data in which a prescribed area within the base surface, protruding surface, and recessed surface is a valid area and the remaining area is an invalid area to extract the measured data for the valid area from measured data for the sidewall surface of the master disk. A master data generation unit generates master data indicating the surface shape of the master disk using the measured data for the valid area. A user compares shape values for the uneven plate and the master data to check the measurement accuracy of a shape inspection device.