PURPOSE: To provide the individual identification device with excellent fingerprint identification accuracy and built up with a comparatively small sized system.

CONSTITUTION: The device is provided with a fingerprint input means 1 fetching optical a fingerprint of a finger of an identification object person to obtain a fingerprint contrast image, a characteristic extract means 2 obtaining group delay spectra 21, 22 from the fingerprint contrast image, and a discrimination means 3 discriminating whether or not the identification object party is the same as the fingerprint registration party by collating the pattern of the group delay spectra 21, 22 with the pattern of the registered group delay spectrum.