The present invention relates to a display device, a backlight unit, a light emitting module, and a lens. The light emitting module according to an embodiment of the present invention comprises: a light emitting element; and a lens arranged above the light emitting element and dispersing light emitted from the light emitting element. The lens comprises: a light entrance unit, through which the light emitted from the light emitting element enters; and a light exit unit, through which the incident light exists, wherein each planar shape of the light entrance unit and the light exit unit has a longer axis and a shorter axis, wherein the longer axis of the light entrance unit and the longer axis of the light exit unit are arranged to be perpendicular to each other, and the lens may have a slant surface formed on a lower surface thereof, the slant surface being slanted downward with respect to the horizontal surface as it extends outward. According to the present invention, the distribution of light emitted from the light emitting module can have a shape close to a rectangular shape and thus enables, through a combination with the distribution of light emitted from an adjacent light emitting module, emission of uniform light to the outside.