A light guide body which has an upper surface and a lower surface, and is configured to cause at least some of the light which is incident from one end of the light guide body to propagate to the other end of the light guide body so that irradiation light is emitted from the upper surface, the light guide body comprising: first dots that are formed from the lower surface toward the upper surface and are arranged on the lower surface; and second dots that are formed from the lower surface toward the upper surface and are arranged on the lower surface, wherein at least some of the light reflected at the second dots becomes the irradiation light, wherein a plurality of pairs each of which is formed of a first dot and a second dot adjacent to each other are arranged, wherein, in each pair, a length of the first dot in a propagation direction of the light on the lower surface is larger than a length of the second dot in the propagation direction of the light on the lower surface, wherein, in each pair, the first dot is disposed beside the second dot, the second dot being disposed further than the first dot from the one end in the propagation direction of the light, wherein, in each pair, an inclined angle of a surface of the first dot with respect to the lower surface is smaller than an inclined angle of a surface of the second dot with respect to the lower surface, wherein, in a pair disposed at a position closest to the one end, a depth of the first dot is larger than a depth of the second dot, wherein, in pairs adjacent to each other, a depth of the first dot is increased as the first dot comes closer to the one end, and a depth of the second dot is reduced as the second dot comes closer to the one end, characterized in that a gap between the first dot and the second dot becomes smaller as the pair comes closer to the one end, and in that the second dot has a tip end on an upper surface which is a curved surface, and a side surface which is a conical surface. first dots that are formed from the lower surface toward the upper surface and are arranged on the lower surface; and second dots that are formed from the lower surface toward the upper surface and are arranged on the lower surface, wherein at least some of the light reflected at the second dots becomes the irradiation light, wherein a plurality of pairs each of which is formed of a first dot and a second dot adjacent to each other are arranged, wherein, in each pair, a length of the first dot in a propagation direction of the light on the lower surface is larger than a length of the second dot in the propagation direction of the light on the lower surface, wherein, in each pair, the first dot is disposed beside the second dot, the second dot being disposed further than the first dot from the one end in the propagation direction of the light, wherein, in each pair, an inclined angle of a surface of the first dot with respect to the lower surface is smaller than an inclined angle of a surface of the second dot with respect to the lower surface, wherein, in a pair disposed at a position closest to the one end, a depth of the first dot is larger than a depth of the second dot, wherein, in pairs adjacent to each other, a depth of the first dot is increased as the first dot comes closer to the one end, and a depth of the second dot is reduced as the second dot comes closer to the one end, characterized in that a gap between the first dot and the second dot becomes smaller as the pair comes closer to the one end, and in that the second dot has a tip end on an upper surface which is a curved surface, and a side surface which is a conical surface.