1. An image classification device comprising: an image specification unit operable to specify, among a plurality of images included in an image group which have been sequentially photographed with respect to one event, one or more images in which an object having a predetermined feature appears; an evaluation value calculation unit operable to calculate an evaluation value of the object having the predetermined feature based on a degree of dispersion of the images specified by the image specification unit among the plurality of images included in the image group in terms of values indicated by respective pieces of time information each reflecting a photographing time of a corresponding one of the plurality of images; and an image group classification unit operable to classify the event relating to the image group based on the evaluation value calculated by the evaluation value calculation unit.