To provide a prize device of a pachinko machine enabling a game player to easily observe a pachinko ball flowing into a cavity part so as to heighten the interest of a game, and enough improve services given to the game player.

This prize device of a pachinko machine is provided with windows 23a, 23b opened in the front, and the cavity parts S communicating with the windows 23a, 23b and forcing the inflow pachinko ball B to flow down along the top surfaces of bottom walls 44, 48. the bottom walls 44, 48 are formed of translucent material, and at least one set of light emitting elements 58 formed by light emitting diodes 58a respectively emitting light of three primary colors; red, green and blue is disposed below the bottom walls 44, 48. Thus, the interior of the cavity part S is illuminated from below through the bottom walls 44, 48 by disposing at least two or more light emitting diodes 58a emitting light of different colors.