| 摘要 |
PROBLEM TO BE SOLVED: To provide a light guide in a vehicular light that is excellent in light transmission efficiency and light receiving efficiency at the time of light incidence, can prevent exposure, temperature rise or the like due to the adhesion of dust or the like to its surface, and can be manufactured at low cost. SOLUTION: One light guide 2 having a large diameter can be formed by means of injection molding of a resin material, so that the light guide is excellent in light transmission efficiency and light receiving efficiency at the time of light incidence, can emit light to a predetermined position and can be manufactured at low cost. The light guide can prevent dust or the like from adhering to the surface of a core material 23A by virtue of a surface treatment layer 24A, so that it can prevent exposure, temperature rise or the like due to the adhesion of dust or the like to the surface and its cost is low.
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