A liquid crystal display device includes a cover bottom including a first bottom surface in a polygonal shape, a first side formed upward from each edge of the first bottom surface, and a first hole formed at the bottom surface, the first side, or the edge; an LED FPCB disposed at an inner surface of the first side; multiple LEDs mounted on the LED FPCB; a reflective plate provided with a second hole formed at a position corresponding to the first hole, the reflective plate being disposed on an upper surface of the first bottom surface; and a cable FPCB provided with a first end extending from one side of the LED FPCB to transmit power or a driving signal from outside, to the LED FPCB, and provided with a second end penetrating through the first hole and the second hole and being disposed outside the cover bottom.