| 摘要 |
A light source device includes a first light source group, a second light source group, a light guide body, and a light diffusion body. The light guide body includes a high light distribution region and a low light distribution region generated by the respective light sources of the second light source group. The high light distribution region includes a plurality of first portions. The low light distribution region includes a second portion between the first portions and a third portion. The presence ratio of the light diffusion body 30 in the third portion is greater than that in the first portion. The quantity of light incident in the light guide body from an end light source located so as to correspond to the third portion is smaller than that from a center light source arranged so as to correspond to the second portion.
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