An information processing device includes an image acquirer that acquires a shot image of a user, a registered user information holder that holds face identification data of a registered user, and a first authentication section that detects a face image of a registered user existing in the shot image by using face identification data held in the registered user information holder. The information processing device further includes a second authentication section that detects an image of an object having a predetermined positional relationship with a region of the face image detected by the first authentication section, and an information processing section that executes information processing based on detection results by the first authentication section and the second authentication section. The second authentication section uses information obtained in detection processing by the first authentication section for detection processing of the image of the object.