A backlight assembly is disclosed that is capable of enabling easy narrow bezel design and easily radiating heat generated from a light source, and a liquid crystal display device using the same. The backlight assembly includes a bottom cover, a light guide plate placed on the bottom cover, a printed circuit board having an L-shaped form and attached to a bottom surface and inner lateral surface of the bottom cover, and a plurality of Light Emitting Diode (LED) packages being mounted to the printed circuit board, wherein the printed circuit board includes a single metal layer having the L-shaped form and attached to the bottom surface and the inner lateral surface of the bottom cover; and a Resin Coated Copper (RCC) film attached to an inner lateral surface of the single metal layer.