A face image in which a user's face turns to a direction different from the front is picked up clearly and individual authentication is executed more precisely. An authentication system for executing authentication of a user is provided, wherein the authentication system comprises a first image pickup unit for picking up a face image of the user; a second image pickup unit for picking up a face image of the user from a direction different from that of the first image pickup unit, a direction calculation unit for acquiring a direction to which the user's face turns on the basis of the face images picked up by the first and the second image pickup units, and a selection unit for selecting at least one of the face images picked up by the first and second image pickup units on the basis of the direction to which the user's face turns.