A backlight unit includes a light source module including a plurality of light sources, a reflection sheet configured to reflect light emitted rearward from the plurality of light sources, and a diffuser plate provided in front of the light source module, where the diffuser plate includes at least two regions having different distances to the plurality of light sources, wherein a first gloss of a first region of the at least two regions and a second gloss of a second region of the at least two regions are different from each other.