Provided is a technique that makes it possible to analyze the walking characteristics of a walker appearing in filmed images and specifying said walker without being affected by the walker's direction of movement with respect to the imaging device. The individual identification device according to one aspect of the present invention is provided with: a storage unit for storing individual identification data for identifying an individual who demonstrates the walking characteristics of the individual in real space； an image-acquiring unit for acquiring filmed images in which a walker is filmed, the images comprising depth data representing the depth of each pixel； a walking characteristic analysis unit for acquiring analysis data representing the walker's walking characteristics in real space by extracting a region in the filmed images in which the walker appears and on the basis of the depth of each pixel in the filmed images, analyzing the walking characteristics of the walker appearing in said region in real space； and a walker-specifying unit for assessing whether or not the acquired analysis data fits individual identification data by comparing the acquired analysis data with individual identification data and specifying the walker appearing in the filmed images on the basis of the assessment results.L'invention concerne une technique qui permet d'analyser les caractéristiques de marche d'un marcheur apparaissant dans des images filmées et de définir ledit marcheur sans être affecté par la direction de mouvement du marcheur par rapport au dispositif d'imagerie. Le dispositif d'identification individuelle selon un aspect de la présente invention est pourvu : d'une unité de stockage pour stocker des données d'identification individuelle pour identifier un individu qui présente les caractéristiques de marche de l'individu dans l'espace réel； une unité d'acquisition d'image pour acquérir des images filmées où un marcheur est filmé, les images comprenant des données d
