PROBLEM TO BE SOLVED: To provide an individual authentication device which is hard receive variation over time, and can highly accurately recognize an individual.SOLUTION: An individual authentication device 1 includes: acquisition parts 16 and 17 for acquiring measurement results including body weight and physical impedance a calculation part 11 for calculating an calculation value related to a body composition which is hard to vary over time compared to a moisture amount in the body, on the basis of the measurement results acquired by the acquisition parts and individual information a storage part 12 for storing the body weight, the individual information and the calculation value in association with a measured person specifying information which specifies a measured person a comparison part 11 for comparing a last calculation value with a new calculation value and a measured person specifying part 11 for specifying that the measurement result acquired by the acquisition part is the measurement result corresponding to which measured person specifying information among the measured persons specific information stored in the storage part, on the basis of a difference of the calculation values.COPYRIGHT: (C)2014,JPO&INPIT【課題】経時的な変動を受けにくくて、高い精度で個人認識を行うことができる個人認証装置を提供する。【解決手段】個人認証装置1は、体重と身体インピーダンスとを含む測定結果を取得する取得部16,17と、取得部によって取得された測定結果と、個人情報と、に基づいて、身体中の水分量に比して経時的に変動しにくい体組成に関する演算値を演算する演算部11と、体重と個人情報と演算値とを、被測定者を特定する被測定者特定情報に関連付けて記憶する記憶部12と、直近の演算値と新規演算値とを比較する比較部11と、演算値の差分に基づいて、取得部によって取得された測定結果が、記憶部に記憶された被測定者特定情報のうち、いずれの被測定者特定情報に対応する測定結果であるかを特定する被測定者特定部11と、を備える。【選択図】図2
