PROBLEM TO BE SOLVED: To provide a vein authentication system and a vein authentication method that are capable of correctly determining authenticity of a finger by using a vein of a living body.SOLUTION: The invention is a vein authentication system which determines the authenticity of a living body by using the vein of the living body. The vein authentication system comprises a sensor unit and a determination unit. The sensor unit comprises: a guide for placing the living body and an image sensor that acquires image data containing an image of the vein of the living body placed on the guide. The determination unit judges whether or not first image data and second image data are in a predetermined relationship, and on the basis of this judgment, determines whether an object placed on the guide is a living body. The first image data is acquired by the image sensor in a first state, which is a state before pressure applied to the guide by the living body is changed. The second image data is acquired by the image sensor in a second state, which is a state after the pressure applied to the guide by the living body is changed.COPYRIGHT: (C)2014,JPO&INPIT【課題】生体の静脈を用いて指の真贋を正しく判定することができる静脈認証システム、および静脈認証方法を提供する。【解決手段】生体の静脈を用いて前記生体の真贋を判定する静脈認証システムであって、生体を置かせるためのガイドと、ガイドに置かれた生体の静脈画像を含む画像データを取得する画像センサとを有したセンサ部と、ガイドへの生体の押し付け具合を変える前の第1の状態で画像センサが取得した第1の画像データと、ガイドへの生体の押し付け具合を変えた後の第2の状態で画像センサが取得した第2の画像データとが所定の関係にあるか否かを判断し、この判断に基づいて前記ガイドに置かれた物体が生体であるか否かを判定する判定部と、を備える。【選択図】図7
