Disclosed is an improved LCD device for preventing moisture infiltrating into the LCD device, including: A liquid crystal panel; A backlight assembly provided with a lamp and a reflection sheet for supplying light to the liquid crystal panel; a main support frame for receiving the liquid crystal panel and the back light assembly therein, and having slide grooves portions therein; a lower cover formed at an opened side of the main support frame where a lamp of the back light assembly is disposed; and a first upper cover for covering one side of the main support frame and having slides protrusion portions therein, wherein the slide protrusion portions are coupled to the slide groove portions formed in the main support frame.