A fingerprint image obtaining unit (1) obtains a fingerprint image of multiple fingers. A vein image obtaining unit (3) obtains a palm vein image. An authentication information DB (6) stores reference vein characteristic information, and a reference direction of a predetermined finger in a reference palm vein image for which the reference vein characteristic information is obtained. A reference obtaining unit (20) detects a longitudinal direction of a predetermined finger based on the fingerprint image obtained by the fingerprint image obtaining unit (1). A position correcting unit (40) corrects the palm vein image obtained by the vein image obtaining unit (3) based on the longitudinal direction of the predetermined finger detected by the reference obtaining unit (20), and the reference direction of the predetermined finger. A vein characteristic information extracting unit (4) obtains vein characteristic information from a corrected palm vein image. A verification processing unit (32) matches the vein characteristic information obtained by the vein characteristic information extracting unit (4) with the reference vein characteristic information for authentication.
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