The present invention provides a backlight unit and liquid crystal display
device having the same, by which cooling performance is prevented from
being lowered in a manner of arranging inverter elements in a horizontal
direction. The present invention includes a lamp unit comprising a
plurality of light-emitting lamps wherein electrodes are provided to both
ends of each of the light-emitting lamps and an inverter provided to a
rear side of the lamp unit in a horizontal direction to apply power to a
plurality of the light-emitting lamps. And, the inverter includes at
least one inverter printed circuit board arranged on a lower part of the
rear side of the lamp unit in the horizontal direction and a plurality of
transformers and inverter elements arranged on the at least one inverter
printed circuit board in the horizontal direction.