To provide an illumination structure of a game machine capable of improving light performance effects by providing an illumination part at a position invisible from a player, and capable of constituting a light-emitting structure with excellent taste even in a small illumination installation area.

The illumination structure of a game machine 1 executes a game performance by emitting light in a front face 10 of the game machine 1. The illumination structure includes a protrusion part 25 protruding forward from the game machine 1, and a cover part 26 extendingly formed from the protrusion part 25. An external face side in the cover part 26 has an outward illumination part 3 illuminating the outward. An inner face side in the cover part 26 has an inward illumination part 4 for illuminating the front face side of the game machine 1. Light illuminated from the inward illumination part 4 is reflected on the front face 10 of the game machine 1 and reflected light X1 is indirectly visible from the player.