| 摘要 |
An in-vehicle illuminating device 1 capable of efficiently guiding luminous flux emitted from a luminous source to a light guiding body. The in-vehicle illuminating device 1 is provided with a rod-shaped light guiding body 13 which reflects, on its inner surface, light rays incident from an optical incidence plane 16 provided at an end 13a to guide the light rays to the other end longitudinally provided, a lamp 19 which emits light to a direction orthogonal to the longitudinal direction of the rod-shaped light guiding body 13 and is arranged in the vicinity of the optical incidence plane 16, and an light introducing body 20 for introducing the luminous flux emitted from the lamp 19 to the optical incidence plane 16. The light introducing body 20 allows the optical incidence plane 16 to be set within a range of the luminous flux emitted from the lamp 19.
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