A stereoscopic image display device according to an exemplary embodiment includes: a display panel including a plurality of pixels; and a lens panel positioned at a surface where the display panel displays an image, wherein the lens panel includes: a photomodulation unit controlling a light path of light emitted from the display panel; and a first electrode unit and a second electrode unit facing each other via the photomodulation unit interposed therebetween, and wherein the first electrode unit includes a plurality of electrodes that are electrically connected to each other and positioned at different layers, and the second electrode unit includes at least one corresponding electrode overlapping at least one among the plurality of electrodes.