An image processing device including a processing unit, in which in a position in a central part of a frame image region related to a plurality of frame images, an output target region smaller than the frame image region is set as a range for which image data is output, and an out-of-frame monitor region to be a target for detecting a subject is set in a position deviated in a predetermined direction from the central part, in a part of the frame image region outside the output target region.