Disclosed is a stereoscopic image display panel and a stereoscopic image display device including the same, which minimize the degradation of image quality due to crosstalk between left and right images discerned by a viewer, and have enhanced brightness and aperture ratio, wherein the stereoscopic image display panel comprises a first substrate including a plurality of data lines formed at certain intervals apart, a plurality of gate lines formed to intersect the data lines, and first and second pixel groups formed adjacently to each other with two adjacent gate lines therebetween; and a second substrate including a light shield layer formed at one side and other side of each of the first and second pixel groups to have different overlapped widths, and defining an open area of each of the first and second pixel groups, wherein the first and second pixel groups display different stereoscopic images, respectively.