Provided are an information recording object, a reading device and a program devised so that embedded information is difficult to guess. The information recording object (30) provided with a combined image comprising an image (C1) printed in a shiny layer (31) and an image (C2) formed on the image (C1) and printed in a transparent layer (32) is characterized in that: the image (C1) and the image (C2) are each printed with an ink for which the amount of reflected light differs according to viewing angle; for the combined image, one image is visible depending on the viewing angle; the image (C2) is an image in which there is a regularity in feature points in a spatial frequency domain (F2); and the image (C1) is an image in which the feature points in a spatial frequency domain (F1) are disposed at positions that block the regularity.