An endoscope device including an insertion part including an observation optical system and a measuring optical system, wherein the endoscope device is provided with a characteristic value comparing circuit 85 which compares previous characteristic values and current characteristic value to identify previous characteristic values corresponding to the current characteristic values, corresponding to the previous characteristic values, identified by the corresponding to the previous characteristic values, identified by the characteristic value comparing circuit 85, are stored in a storage circuit C2 together with various information. According to the invention, for inspection turbine blades of jet engines, automation (labor-saving) of the inspection process by reducing the number of the inspection steps is realized and the difficulty in the inspection of analysis areas is eliminated.