| 摘要 |
PROBLEM TO BE SOLVED: To easily ensure the mounting space of a plurality of substrate boxes and to reduce a projecting amount to a back side. SOLUTION: A ball downflow passage 111 is formed on a back surface of a game board 60 for joining the winning balls after detected by a winning ball detector and the out balls recovered at an outlet 89, at a junction and guiding the same to a downstream side, and a ball discharging passage 30 is mounted for discharging the winning balls and the out balls guided by the ball downflow passage 111, to the external, that is, as a structure of a lower front side of the mechanism board 200 is unified as the ball discharging passage 306 where the out balls and the winning balls are joined and flow down, a structure at a front surface side of a lower portion of the mechanism board 200 can be simplified, the mounting space can be easily ensured, and a projecting amount to the back side can be reduced even when a plurality of substrate boxes are superpositionally mounted.
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