Abstract: An identification tag 1 provided with a random pattern P readable with an image sensor 2 is configured by three-dimensionally disposing at least a pair of random pattern members 4a and 4b generating moiré fringes M forming the random pattern P in a transparent medium 3. Through this configuration, the moiré fringes M are generated by the random pattern members 4a and 4b and the moiré fringes M serve as a random pattern P (identification information) peculiar to respective identification tags 1 and so on which are difficult to be forged (copied).