A mobile body (1) includes an image slide unit (11), a parallax histogram aggregation unit (13), and a miscalibration detection unit (14). The image slide unit (11) generates a slide image (SLI) obtained by sliding a first viewpoint image (VPI1) in a parallax direction. The parallax histogram aggregation unit (13) generates a parallax histogram (HG) from the slide image (SLI) and a second viewpoint image (VPI2). The miscalibration detection unit (14) determines that the miscalibration has occurred when a lower boundary value of the parallax on the histogram (HG) is smaller than the slide amount of the first viewpoint image (VPI1).