1. A three-dimensional image display device for displaying a three-dimensional image enabling depth perception and produced from a plurality of images acquired by imaging a subject from different viewpoints, the three-dimensional image display device comprising: a timer unit for setting and measuring a given time over which a pop-out amount of the three-dimensional image changes; a pop-out amount change mode memory for storing information on a time-dependent change of the pop-out amount occurring over the given time; a pop-out amount controller for producing the pop-out amount for each unit time based on a parallax between the plurality of images, the given time, and the time-dependent change information; a changing image producer for producing a given number of pairs of pop-out amount changing images from the plurality of images according to a pop-out amount by the unit time; a three-dimensional image producer for producing a corresponding pop-out amount changing three-dimensional image from the given number of pairs of pop-out amount changing images; and a display controller for displaying the corresponding pop-out amount changing three-dimensional image on a monitor based on the given time measured by the timer unit and the unit time.