A liquid crystal display device includes a support main, a lamp housing, a printed circuit board (PCB), a top case and a cover bottom. The support main is a bottom portion of a liquid crystal display device module (LCM). The lamp housing is disposed at sides of the support main in a long side direction of the support main. The PCB is disposed on a back surface of the support main. The top case is a top portion of the LCM and has projection pieces from a side thereof. The cover bottom is disposed on an upper surface of the support main. The cover bottom has first extension pieces for electrical connection to the top case and second extension pieces projected to a lower surface of the support main for electrical connection to the printed circuit board, thereby making secure fastening and grounding.