1. A face identification device comprising: a storage unit for storing a plurality of feature values previously obtained from a face image of a registrant; a face detection unit for detecting a face of a person from an input image; a feature value obtainment unit for obtaining a plurality of feature values from the detected face; a reliability determination unit for determining reliability of each feature value from the input image; and an identification unit for identifying the detected face with the face of the registrant stored on the storage unit by comparing the plurality of feature values stored on the storage unit with the plurality of feature values obtained from the detected face, while taking into account the reliability of each feature value.