A three-dimensional image display device includes: an image display screen 10; a motion parallax amount measurement unit 12 which measures a to-display-screen parallax angle 1 and a to-display-screen separation distance Le with respect to the screen 10; and a display unit 8 which selects a two-dimensional image of the object to be observed that has rotated by an angle corresponding to the parallax angle 1, and transmits the two-dimensional image to the screen 10. Each of the plurality of two-dimensional images is associated with three-dimensional information; the three-dimensional information includes at least the rotational angle and a virtual separation distance Lo between the object to be observed and the image display screen; and the rotational angle of the object to be observed is determined on the basis of the following formula:

=1Le/(Lo+Le).