1. An imaging device for capturing a feature image of a finger, the device comprising: a housing having an area for placing the finger; a light source for irradiating a light to the finger; and an imaging unit which can pick up feature information of a finger vein and feature information of a fingerprint to be used for personal identification with capturing the light from the finger, wherein the imaging unit can pick up both the feature information of the finger vein and the feature information of the fingerprint with placing the finger in the area only once.