To provide a personal identification system that can ensure higher authentication reliability by using a new index in authentication based on a face image.

A surface shape measurement sensor 12 of the personal identification system 10 acquires a registration surface image of the face of a registrant at registration, and a surface feature information extraction part 16 extracts features such as the eyes, nose, mouth, eyebrows and contours. A bone shape measurement sensor 14 acquires a registration perspective image of the viscerocranium of the registrant, and a bone feature information extraction part 20 extracts features such as the orbits, pyriform aperture and cranial contours, and registers them in a registration part 18 as information on the authenticated registrant. For authentication, a surface shape measurement sensor 22 acquires a surface image for authentication of the face of a person subject to authentication, and a surface feature information extraction part 24 extracts features such as the eyes, nose, mouth, eyebrows and contours. An authentication part 26 conducts personal identification between the registrant and the authentication-subjected person according to similarity between the registration surface image and the surface image for authentication and similarity between the registration perspective image and the surface image for authentication.

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