A light guide body (2) includes a light guide main body (21), a band region (4), and radial microstructures (5). The light guide main body (21) is columnar, and light enters the light guide main body (21) from at least one end portion (3). The band region (4) is formed extending in the lengthwise direction of a portion of a circumferential surface of the light guide main body (21). The radial microstructures (5) are arranged in the band region (4) and are formed as microstructures that each have protruding parts extending radially in at least three directions in a band region portion from a reference point.