A three-dimensional image display device includes: a display panel including a plurality of pixels each having red, green and blue sub-pixels, the red, green and blue sub-pixels alternately disposed along a horizontal direction and each of the red, green and blue sub-pixels disposed in a single line along a vertical direction; and a parallax barrier over the display panel, the parallax barrier including a plurality of open areas and a blocking area surrounding the plurality of open areas, the plurality of open areas alternating with the blocking area, and each of the plurality of open areas corresponding to each couple of the adjacent two sub-pixels.