A display device, comprising: a rectangular display part that extends in a longitudinal direction and a transverse direction and that includes a display region configured to display an image; a light source part including a plurality of LEDs; a lens mounted to cover the light source part and to refract and reflect a light of the light source part; a reflection sheet provided on a rear surface side opposite to the display surface of the display part and configured to reflect the light refracted and reflected by the lens; an optical sheet disposed between the display part and the reflection sheet and parallel to the display part; and a rear frame covering the reflection sheet on the rear surface side, wherein the light source part is disposed in an upper portion of the display device with respect to the transverse direction, wherein a hollow light-guiding region is provided between the reflection sheet and the optical sheet, wherein the distance between the reflection sheet and the optical sheet in a thickness direction of the display device is less in a lower portion than in the upper portion with respect to the transverse direction, wherein the plurality of LEDs is disposed to extend in the longitudinal direction of the display part, wherein the display device is characterized in that the display device further comprises a reflection member mounted on the rear surface side of the display part to extend in the longitudinal direction of the display part in a direction in which the plurality of LEDs extends, and wherein the reflection member is reflective on both sides thus having a reflecting first surface and a reflecting second surface and is disposed to slope with respect to the optical sheet, so that the reflecting first surface is configured to reflect light emitted from the lens and the second reflecting surface is configured to reflect a light reflected by the optical sheet in the light-guiding region toward the optical sheet. a rectangular display part that extends in a longitudinal direction and a transverse direction and that includes a display region configured to display an image; a light source part including a plurality of LEDs; a lens mounted to cover the light source part and to refract and reflect a light of the light source part; a reflection sheet provided on a rear surface side opposite to the display surface of the display part and configured to reflect the light refracted and reflected by the lens; an optical sheet disposed between the display part and the reflection sheet and parallel to the display part; and a rear frame covering the reflection sheet on the rear surface side, wherein the light source part is disposed in an upper portion of the display device with respect to the transverse direction, wherein a hollow light-guiding region is provided between the reflection sheet and the optical sheet, wherein the distance between the reflection sheet and the optical sheet in a thickness direction of the display device is less in a lower portion than in the upper portion with respect to the transverse direction, wherein the plurality of LEDs is disposed to extend in the longitudinal direction of the display part, wherein the display device is characterized in that the display device further comprises a reflection member mounted on the rear surface side of the display part to extend in the longitudinal direction of the display part in a direction in which the plurality of LEDs extends, and wherein the reflection member is reflective on both sides thus having a reflecting first surface and a reflecting second surface and is disposed to slope with respect to the optical sheet, so that the reflecting first surface is configured to reflect light emitted from the lens and the second reflecting surface is configured to reflect a light reflected by the optical sheet in the light-guiding region toward the optical sheet.