PURPOSE: To provide a lighting system which supplies light to a headlight and to another portion via optical fiber using a single light source, the light being transmitted to the optical fiber in large quantities.

CONSTITUTION: A lighting system 2 casts light ahead of a vehicle using a light source 1 and also transmits light to an auxiliary headlight 4 via optical fiber 3 so that the auxiliary headlight 4 also casts light ahead of the vehicle. A reflector case 5 enclosing the light source 1 of the lighting system 2 has a headlight reflector 8 whereby the light that the light source 1 emits is directed ahead of the vehicle via a lens 6 and an optical fiber reflector 9 whereby the light that the light source 1 emits is converged to the end face of the optical fiber 3. The optical fiber reflector 9 allows the light that the light source 1 emits to efficiently enter the optical fiber 3, thus increasing the quantity of light transmitted to the optical fiber 3.