1. An image display device comprising: an image display unit for displaying a still image or a moving image; an image capturing unit for capturing the image in a direction in which the image display unit displays the still image or the moving image; and a face detection unit for carrying out face detection processing, in which a face of a user which is included in the image captured by the image capturing unit is detected, at given intervals, wherein the given intervals are variable according to whether or not the face of the user is included in the image captured by the image capturing unit, and wherein when the detected face undergoes no change in position in whole or in part for a given time in the course of the face detection processing, the face detection unit does not detect the face as the face of the user.