In an identifying device for performing personal identification using biometrics information such as an iris, face, blood vessel pattern, auricle, fingerprint, palm print, hand print or the like, in order to surely discriminate a living body from a non-living body and to surely preclude illegal use by impersonation using a forged fingerprint or the like, a biometrics information input section samples/inputs biometrics information for verification as image information from a living body portion relatively moving with respect to this biometrics information input section, and living-body detection surfaces in a living-body detecting means is arranged in contact with or in the proximity to the living body portion being moved with respect to the biometrics information input section so as to input the biometrics information for verification.