A stereoscopic image display device, including: an image displaying unit including a plurality of pixels, the plurality of pixels displaying a left-eye image and a right-eye image, a first light blocking unit having a lattice structure including a plurality of openings corresponding to the plurality of pixels, and a second light blocking unit extending from the first light blocking unit into horizontal center portions of the plurality of openings; and a parallax barrier opposed to the image displaying unit, the parallax barrier including transmitting regions and blocking regions, the transmitting regions and the blocking regions extending in a vertical direction and being alternately disposed to spatially divide the left-eye image and the right-eye image displayed by the image displaying unit.