To provide a lighting system capable of emitting light (capable of achieving a wide irradiation range) with controlled light distribution in one direction (for instance, a downward direction) without increasing the number of substrates (only by installing the substrate for mounting an LED light source directing its optical axis horizontally to a side face of a columnar supporting member).

In the lighting system, the light sources 1 for illumination and lenses 2 for controlling light distribution are arranged on only the side face 26a of the columnar support member. The lenses 2 for controlling light distribution are set up to have the light from the light sources 1 for illumination emitted in one direction (for example, a downward lower direction) Y, and a light guide member 92 for guiding light by taking in the emitted light from the lenses 2 for controlling light distribution is arranged on the top face at a side of the one direction Y of the columnar support member.