A display apparatus comprising: a board layer; a light emitting part comprising a light emitting device mounted on the board layer and a lens disposed above the light emitting device; a reflective layer disposed on a top surface of the board layer; an optical sheet disposed above the reflective layer at a height spaced apart from the light emitting part; and a display panel disposed on a top surface of the optical sheet, wherein the lens comprises a bottom surface portion covering the light emitting device, the bottom surface portion including a bottom surface center portion recessed upward by a predetermined height, characterized by the bottom surface center portion including: - a bottom portion which is opened and has an edge with a track-shaped oval shape in which two straight-line sections and two curved-line sections are connected to each other; - a vertical extension portion vertically extending upward from the edge of the bottom portion; - two first roof portions above the parts of the bottom portion which are delimited by the curved-line sections, which i) roundly extend upward from a curved-line section of the upper end of the vertical extension portion and ii) extend in a shape of which a transverse width becomes gradually narrow from the upper end of the vertical extension portion towards a respective upper tip of the first roof portions; - a second roof portion above the part of the bottom portion which is delimited by the straight-line sections in the space defined by the vertical extension portion and the first roof portion, wherein: -- a lower end of the second roof portion is positioned at a predetermined vertical position between the straight-line section of the bottom portion and a curved-line section of the upper end of the vertical extension portion, -- the upper end of the second roof portion is a straight line connecting the respective upper tips of the first roof portions, and -- the second roof portion extends upward in a rounded shape that is convex in a central direction of the space defined by the vertical extension portion and the first roof portion. a board layer; a light emitting part comprising a light emitting device mounted on the board layer and a lens disposed above the light emitting device; a reflective layer disposed on a top surface of the board layer; an optical sheet disposed above the reflective layer at a height spaced apart from the light emitting part; and a display panel disposed on a top surface of the optical sheet, wherein the lens comprises a bottom surface portion covering the light emitting device, the bottom surface portion including a bottom surface center portion recessed upward by a predetermined height, - a bottom portion which is opened and has an edge with a track-shaped oval shape in which two straight-line sections and two curved-line sections are connected to each other; - a vertical extension portion vertically extending upward from the edge of the bottom portion; - two first roof portions above the parts of the bottom portion which are delimited by the curved-line sections, which i) roundly extend upward from a curved-line section of the upper end of the vertical extension portion and ii) extend in a shape of which a transverse width becomes gradually narrow from the upper end of the vertical extension portion towards a respective upper tip of the first roof portions; - a second roof portion above the part of the bottom portion which is delimited by the straight-line sections in the space defined by the vertical extension portion and the first roof portion, -- a lower end of the second roof portion is positioned at a predetermined vertical position between the straight-line section of the bottom portion and a curved-line section of the upper end of the vertical extension portion, -- the upper end of the second roof portion is a straight line connecting the respective upper tips of the first roof portions, and -- the second roof portion extends upward in a rounded shape that is convex in a central direction of the space defined by the vertical extension portion and the first roof portion.