A liquid crystal display device includes a backlight unit and a display panel. The backlight unit includes a light source member and a reflective sheet. The light source member includes light emitting elements, and the light emitting elements include a lens totally reflecting light laterally towards a side surface of backlight unit. The reflective sheet defines a bottom part and cover parts. The bottom part extends to be disposed under the light source member and defines a plurality of opening parts of the first reflective sheet. The cover parts are respectively bent from one side of each of the opening parts toward the display panel. Also, the cover parts are in one-to-one correspondence with the opening parts.