The present invention is for a stereoscopic image display device to achieve enhanced brightness during 3D image display using a switchable barrier and brightness enhancement polarizing films, the stereoscopic image display device includes a backlight unit to transmit light upward, a barrier cell located on the backlight unit, the barrier cell functioning as a barrier when voltage is applied thereto and a transparent cell when voltage is not applied thereto, a first brightness enhancement polarizing film attached to an upper surface of the barrier cell, and an image panel located on the first brightness enhancement polarizing film.