A person identifying device (1) comprises: a region dividing unit (102) that, for each image, divides a region surrounding a person detected by a person detecting unit (12); a region feature extracting unit (103) that, for each image, extracts partial person features of the person detected by the person detecting unit (12), on the basis of the region divided by the region dividing unit (102); and a region feature comparing unit (104) that compares the partial person features extracted for each image by the region feature extracting unit (103), and thereby determines whether the person detected in each image by the person detecting unit (12) is the same person.