A backlight module having a substrate having an elongated shape in a longitudinal direction and a predetermined length, and a plurality of light emitting devices disposed on the substrate, and a plurality of lenses disposed on the plurality of light emitting devices, each lens of the plurality of lenses comprising: a light entering part formed in a concave shape in a lower region of the lens, and on which light emitted from the light emitting device is incident; and a light exiting part through which the light incident through the light entering part is emitted to the outside, wherein each of the light entering part and the light exiting part has a shape having a major axis and a minor axis in plan view, and the major axis of the light entering part is orthogonal to the major axis of the light exiting part, and wherein the light entering part comprises a light incident vertical surface extending from the lower surface of the lens and a light incident inclined surface extending upward from the light incident vertical surface, wherein each lens of the plurality of lenses is arranged so that the major axis of the light exiting part is perpendicular to the longitudinal direction of the substrate. a substrate having an elongated shape in a longitudinal direction and a predetermined length, and a plurality of light emitting devices disposed on the substrate, and a plurality of lenses disposed on the plurality of light emitting devices, each lens of the plurality of lenses comprising: a light entering part formed in a concave shape in a lower region of the lens, and on which light emitted from the light emitting device is incident; and a light exiting part through which the light incident through the light entering part is emitted to the outside, wherein each of the light entering part and the light exiting part has a shape having a major axis and a minor axis in plan view, and the major axis of the light entering part is orthogonal to the major axis of the light exiting part, and wherein the light entering part comprises a light incident vertical surface extending from the lower surface of the lens and a light incident inclined surface extending upward from the light incident vertical surface, wherein each lens of the plurality of lenses is arranged so that the major axis of the light exiting part is perpendicular to the longitudinal direction of the substrate. a light entering part formed in a concave shape in a lower region of the lens, and on which light emitted from the light emitting device is incident; and a light exiting part through which the light incident through the light entering part is emitted to the outside, wherein each of the light entering part and the light exiting part has a shape having a major axis and a minor axis in plan view, and the major axis of the light entering part is orthogonal to the major axis of the light exiting part, and wherein the light entering part comprises a light incident vertical surface extending from the lower surface of the lens and a light incident inclined surface extending upward from the light incident vertical surface, wherein each lens of the plurality of lenses is arranged so that the major axis of the light exiting part is perpendicular to the longitudinal direction of the substrate.