A backlight unit and a display apparatus are provided, the display apparatus including: a display panel on which an image is displayed; and a backlight unit which provides backlight to the display panel, the backlight unit including a plurality of light guide plates, a plurality of substrates which are respectively disposed on at least two surfaces of the corresponding plurality of light guide plates, and a plurality of light emitting units which are respectively disposed between the plurality of light guide plates, and respectively disposed on a surface of the corresponding plurality of substrates. Therefore, a heat radiating surface of a backlight unit is broadened, thereby improving a heat radiating effect and causing the backlight unit to be assembled easily.