A face authentication system includes a data input section for obtaining three-dimensional data concerning a face area of a subject at multiple points, and a processor for performing a registration process or a verification process of authentication data of the subject based on the three-dimensional data. The processor has a quality rater for rating a quality of the three-dimensional data with respect to each of the points of the three-dimensional data to generate quality data, and a quality distribution deriving section for deriving a distribution of the quality with respect to the face area, based on the quality data.