A display device comprising: a light guide plate (20, 40) comprising an incident end surface, a reflection surface, and an emission surface facing the reflection surface, wherein the light guide plate (20, 40) is configured to propagate light incident from the incident end surface and emit the light from the emission surface, the light guide plate (20, 40) further comprising a prism (24, 26) provided on the reflection surface and configured to reflect the light incident from the incident end surface; a first light source (11, 13) configured to cause the light to be incident on the incident end surface of the light guide plate (20, 40); and a concealing plate that includes a light transmitter that is disposed on a side of the emission surface of the light guide plate (20, 40) and is configured to transmit the light emitted from the emission surface of the light guide plate (20, 40), and a light shielding portion having a light transmittance lower than a light transmittance of the light transmitter, characterized in that the light guide plate (20, 40) has an inclined surface group formed by a plurality of inclined surfaces on a side end surface excluding the incident end surface of the light guide plate (20, 40) and a facing end surface facing the incident end surface, and and in that a line segment connecting a center of a side of each of the plurality of inclined surfaces and a center of the first light source (11, 13), and the sides of the inclined surfaces are substantially perpendicular. a light guide plate (20, 40) comprising an incident end surface, a reflection surface, and an emission surface facing the reflection surface, wherein the light guide plate (20, 40) is configured to propagate light incident from the incident end surface and emit the light from the emission surface, the light guide plate (20, 40) further comprising a prism (24, 26) provided on the reflection surface and configured to reflect the light incident from the incident end surface; a first light source (11, 13) configured to cause the light to be incident on the incident end surface of the light guide plate (20, 40); and a concealing plate that includes a light transmitter that is disposed on a side of the emission surface of the light guide plate (20, 40) and is configured to transmit the light emitted from the emission surface of the light guide plate (20, 40), and a light shielding portion having a light transmittance lower than a light transmittance of the light transmitter, a light transmitter that is disposed on a side of the emission surface of the light guide plate (20, 40) and is configured to transmit the light emitted from the emission surface of the light guide plate (20, 40), and a light shielding portion having a light transmittance lower than a light transmittance of the light transmitter, characterized in that the light guide plate (20, 40) has an inclined surface group formed by a plurality of inclined surfaces on a side end surface excluding the incident end surface of the light guide plate (20, 40) and a facing end surface facing the incident end surface, and and in that a line segment connecting a center of a side of each of the plurality of inclined surfaces and a center of the first light source (11, 13), and the sides of the inclined surfaces are substantially perpendicular.