According to one embodiment, a display device includes a first light guide including a first main surface, a second main surface, a first end portion opposed to light-emitting elements, and a second end portion, a first layer which is arranged to be in contact with the first main surface, and a second layer which is arranged to be in contact with the first main surface, and is located between the first layer and the second end portion, wherein the first light guide has a first refractive index, the first layer has a second refractive index lower than the first refractive index, the second layer has a third refractive index higher than the second refractive index, and the first layer is located at a position closer to the first end portion than the second layer.