To accurately estimate an abnormal region of a subject from an image.SOLUTION: The abnormal region estimation device for estimating a region having an abnormality in a subject from intra-coded information, which is information obtained by intra-coding an image obtained by capturing an image of the subject having regularity in appearance, includes: a division coding information acquisition unit that acquires division coding information which is intra-coded information related to a region into which the image is divided; and an abnormality estimation unit that, based on a regularity of division coding information on a desired area of the image, and division coding information on a region excluding the desired region, estimates whether or not the desired region has an abnormality.SELECTED DRAWING: Figure 1
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