A backlight unit is disclosed, to remove an unnecessary portion from a PCB and to decrease the number of connectors and wires, which includes a plurality of light-emitting lamps arranged in one direction inside a lamp housing; first and second driving unit PCBs positioned at both sides on the rear surface of the lamp housing, to apply a power to the light-emitting lamps; first and second connection PCBs positioned at both sides of the lamp housing, wherein the respective first and second connection PCBs are separately provided from the first and second driving unit PCBs; and first and second power supplying wires for the respective connection between the first and second driving unit PCBs with the first and second connection unit PCBs.