An information processing device includes an image acquirer that acquires a shot image of an object having a marker, a marker detector that detects an image of the marker from the shot image, and an information processing section that executes information processing based on a detection result by the marker detector. The marker detector identifies the image of the marker among color regions that are extracted from the shot image and have predetermined colors based on the positional relationship between a region that is assumed when one color region of the color regions extracted is a marker and is covered by an image of an object having the marker and another color region extracted.