The false finger decision technology whose it is possible to improve the decision precision of the false finger, is offered. As decision object ones, as aforementioned decision object ones on the basis of acquisition expedient and the aforementioned line width information which acquire the line width information which relates to the line width of the Takashi line of the finger or the line width of the trough line, it has with the decision expedient which decides whether the finger is the genuine finger, or is the false finger.偽指の判定精度を向上させることが可能な偽指判定技術を提供する。判定対象物としての指の隆線の線幅または谷線の線幅に関わる線幅情報を取得する取得手段と、前記線幅情報に基づいて、前記判定対象物としての指が本物の指であるか偽指であるかを判定する判定手段とを備える。
