A stereoscopic image display apparatus is provided which includes an image display panel and a parallax barrier having parallax barrier pieces in the front of the image display panel. In the stereoscopic image display apparatus, the image display panel has a pixel pattern in which left-eye sub pixels and right-eye sub pixels are alternately arranged in horizontal and vertical directions. The parallax barrier is spaced apart from the image display panel by a predetermined distance and the parallax barrier pieces with a predetermined size are arranged at a predetermined interval in the horizontal and vertical directions so as to allow a left eye and a right eye to separately recognize a left-eye image and a right-eye image formed by the left-eye sub pixels and the right-eye sub pixels, respectively. Accordingly, since a strip pattern is removed from s stereoscopic image, it is possible to obtain a natural stereoscopic image. In addition, since a strip pattern and a color mixing phenomenon are removed from s stereoscopic image, it is possible to obtain a natural and clear stereoscopic image.