PROBLEM TO BE SOLVED: To provide a biometric authentication device for preventing the deterioration of authenticating precision by reducing the projection of external rays of light on the finger of a user.SOLUTION: The biometric authentication device for acquiring the information of the vein of the finger by irradiating the finger of a user with the rays of light from a light source includes: a guide for forming a space where the finger of the user is placed, and for interrupting external rays of light to be made incident from the horizontal direction of the space an absorber arranged on the surface of the guide for absorbing the reflected rays of light of the external rays of light made incident from the upper part of the space a filter arranged at the bottom of the space, and equipped with a reflection surface for reflecting the external rays of light made incident to the space to the direction of the absorber and an image pickup part arranged under the filter for imaging the vein of the finger of the user which has received the rays of light emitted from the light source.COPYRIGHT: (C)2011,JPO&INPIT【課題】利用者の指に対する外光の映り込みを低減し、認証精度の低下を防止することができる生体認証装置を提供する。【解決手段】光源から光を利用者の指に照射して指の静脈の情報を取得する生体認証装置であって、利用者の指が置かれる空間を形成し、その空間の横方向から入射する外光を遮るガイドと、ガイドの表面に配置され、その空間の上方から入射した外光の反射光を吸収する吸収体と、その空間の底部に配置され、その空間に入射した外光を吸収体の方向に反射させる反射面を有するフィルタと、フィルタの下に配置され、光源から照射された光を受けた利用者の指の静脈を撮像する撮像部と、を備える。【選択図】図2
