1. An image processing device comprising: an image acquisition unit configured to acquire a plurality of images captured by a camera array image capturing device having a plurality of image capturing units the exposure conditions of which are different from one another; an overlap region calculation unit configured to calculate an overlap region in which field angles overlap in the plurality of image capturing units from the acquired plurality of images; and a blurred image detection unit configured to detect an image including a blur using a region image of the plurality of images corresponding to the overlap region calculated by the overlap region calculation unit.