A display device provided with a display panel and an illumination section that illuminates the display panel, the illumination section comprising: a light guide plate having a first surface and a second surface facing each other; a light source facing an end surface of the light guide plate; an adhesive layer formed adjacent to the first surface of the light guide plate; a light reflection layer bonded to the first surface of the light guide plate with at least the adhesive layer in between; and a low refractive index layer between the adhesive layer and the light reflection layer; wherein the adhesive layer has substantially the same refractive index as a refractive index of the light guide plate; wherein the low refractive index layer has a lower refractive index than the refractive index of the adhesive layer; wherein the light guide plate is configured of a light entry section on an end surface side that faces the light source, and a light guiding section including the first surface and the second surface; wherein the light entry section has a tapered shape that is narrowed toward the light source; characterized in that diffusion dots are formed in a predetermined pattern on the first surface of the light guide plate, the adhesive layer is provided to cover the diffusion dots; wherein an inclination angle (θt), a length, and a height of the tapered shape of the light entry section are configured such that a first light emitted from the light source is refracted by an entry surface of the light entry section, and a refracted light (L1a) is reflected by the tapered shape of the light entry section to enter the light guiding section, and when a second light (L1b) is reflected by the reflection sheet and a third light is reflected by the interface between the adhesive layer and the low refractive index layer, the second light (L1b) and the third light propagate through the light guiding section while repeating reflection; and wherein a total reflection condition at the second surface is disturbed by the diffusion dots, such that the second light (L1b) and the third light are drawn upward from the light guide plate. a light source facing an end surface of the light guide plate; an adhesive layer formed adjacent to the first surface of the light guide plate; a light reflection layer bonded to the first surface of the light guide plate with at least the adhesive layer in between; and a low refractive index layer between the adhesive layer and the light reflection layer; wherein the adhesive layer has substantially the same refractive index as a refractive index of the light guide plate; wherein the low refractive index layer has a lower refractive index than the refractive index of the adhesive layer; wherein the light guide plate is configured of a light entry section on an end surface side that faces the light source, and a light guiding section including the first surface and the second surface; wherein the light entry section has a tapered shape that is narrowed toward the light source; characterized in that diffusion dots are formed in a predetermined pattern on the first surface of the light guide plate, the adhesive layer is provided to cover the diffusion dots; wherein an inclination angle (θt), a length, and a height of the tapered shape of the light entry section are configured such that a first light emitted from the light source is refracted by an entry surface of the light entry section, and a refracted light (L1a) is reflected by the tapered shape of the light entry section to enter the light guiding section, and when a second light (L1b) is reflected by the reflection sheet and a third light is reflected by the interface between the adhesive layer and the low refractive index layer, the second light (L1b) and the third light propagate through the light guiding section while repeating reflection; and wherein a total reflection condition at the second surface is disturbed by the diffusion dots, such that the second light (L1b) and the third light are drawn upward from the light guide plate. a first light emitted from the light source is refracted by an entry surface of the light entry section, and a refracted light (L1a) is reflected by the tapered shape of the light entry section to enter the light guiding section, and when a second light (L1b) is reflected by the reflection sheet and a third light is reflected by the interface between the adhesive layer and the low refractive index layer, the second light (L1b) and the third light propagate through the light guiding section while repeating reflection; and wherein a total reflection condition at the second surface is disturbed by the diffusion dots, such that the second light (L1b) and the third light are drawn upward from the light guide plate.