To provide a device which yields a novel decoration effect related to the motion of Pachinko balls rolling on the surface of a game board in a Pachiniko game machine, or the like.

The game machine 8 is provided with a game ball contact detector 1 which detects the vibrations from a ball contact body 3, hit by the game balls, with a piezoelectric element 5 to make a light emitting body (multicolor LED) 9 emit the light thereby enabling players to enjoy an illumination effect related to the motion of the game balls 2.