1. An authentication apparatus comprising: a processor; and a memory device storing instructions which when executed by the processor, cause the processor to: (a) acquire a plurality of images which are obtained by consecutively picking up a biological authentication object of a predetermined biological part from different directions in series such that the plural images correspond to a surface figuration of the predetermined biological part; (b) detect points of the plurality of images; (c) using the detected points, map the plurality of images to a body corresponding to the surface figuration of the predetermined biological part; and (d) collate a group of the plurality of images and an image to be compared which is obtained by picking up an image from an arbitrary direction.