1. A personal identification method comprising the steps of: irradiating light to a finger, extracting an image of the light transmitted through the finger, and identifying said image with a registered image by local matching of a part of said image, wherein said local matching is processed by dividing said image and the registered image into a plurality of subregions and obtaining location information of the matching subregions, acquiring an extent of deviation of matching as movement information in each subregion from the initial location and evaluating correlativity of the movement information in each subregion.