1. A personal identification device comprising: a grip having a curvature configured to be grasped by a hand; a light source provided within said grip so as to irradiate light onto a finger of said hand; a camera for picking up the image of the light passed through said finger from said light source; and a processor for extracting a vessel pattern from said image picked up by said camera so as to identify individuals, wherein said camera picks up a plurality of images of a vessel pattern of said finger including a portion between a first joint and a second joint of said finger in a time series where a relative angle between said camera and said finger is varied in a longitudinal direction of said finger, from a tip of the finger toward a palm of the hand, which moves relative to said grip as said grip is grasped by said hand, and wherein said processor performs the personal identification on the basis of the plurality of images picked up in time series and a plurality of registered images previously registered to make a personal authentication when at least one of the plurality of registered images is identified.