To provide a simple lighting system capable of achieving reduction of cost and uniform lighting.

The simple lighting system has a prism part 2 with a light guide face 5 formed capable of either directly reflecting or transmitting light emitted from an LED 3, and a translucent part 6 capable of transmitting the light upward of the prism part 2 is arranged so that the prism part 2 illuminates over the translucent part 6. The light guide face 5 is slanted at a given angle so as to synthesize a plurality of reflected lights containing either the direct light M emitted from the LED 3 or the transmitted light L emitted through the prism part 2 from the LED3.