A lamp-supporting unit includes a mold frame and a lamp-fixing member. The mold frame includes a bottom face, a side face upwardly extending from an edge of the bottom face, and a top face horizontally extending from an upper end of the side face and being opposite to the bottom face. The side face has openings through which lamps are moved. The lamp-fixing member is installed on the bottom face of the mold frame and fixes an end of each of the lamps.