Illuminating device with multiple optical guiding bodies having different luminance distributions

An illuminating device may include an optical guiding body configured to dispose linear optical guiding members side by side, the linear optical guiding members guiding light incident from one end side in a longitudinal direction to another end side. The illuminating device may also include optical sources to emit light toward corresponding linear optical guiding members. The optical guiding body may include first and second optical guiding members adjacent in a width direction. A luminance distribution of the light in the longitudinal direction emitted from the first optical guiding member becomes darker, and that emitted from the second optical guiding member becomes brighter, according to being closer to the other end side from the one end side. The illuminating device may further include a control unit configured to light up the optical sources of the first and second optical guiding members in order and thereafter, light them out in order.