PROBLEM TO BE SOLVED: To provide a biometric authentication device which provides improved security level in authentication process.SOLUTION: A biometric authentication device includes: a memory unit 13 for storing registered biometric information 32, a biometric information classification code 31, and sample biometric information 33 a biometric information classification code producing unit 15 which compares authentication format biometric information 51 with multiple pieces of sample biometric information 33 to calculate degree of similarity respectively and produces a biometric information classification code 31 on the basis of the similarity an authentication priority information producing unit 16 which assigns a priority to the biometric information classification code 31 of each piece of sample biometric information 33 in descending order of similarity between the authentication format biometric information 51 and the sample biometric information 33 on the basis of the similarity, and produces authentication priority information such that the registered biometric information 32 belonging to a group of biometric information classification codes 31 having a lower priority is not used as an authentication subject, on the basis of a prescribed threshold value and an authentication processing unit 17.COPYRIGHT: (C)2013,JPO&INPIT【課題】認証処理におけるセキュリティレベルが向上した生体認証装置を提供する。【解決手段】登録生体情報32と、生体情報区分コード31と、見本生体情報33とを記憶する記憶部13と、認証形式生体情報51と複数の見本生体情報33とを比較してそれぞれ類似度を算出し、類似度に基づいて、生体情報区分コード31を生成する生体情報区分コード生成部15と、類似度に基づいて、認証形式生体情報51が見本生体情報33に類似する順に、各見本生体情報33の生体情報区分コード31に優先順位を付し、予め設定された閾値に基づいて、優先順位が下位の生体情報区分コード31のグループに属する登録生体情報32を認証対象としないように、認証優先情報を生成する認証優先情報生成部16と、認証処理部17と、を備える。【選択図】図2
