| 摘要 |
PROBLEM TO BE SOLVED: To provide a ball passage structure enabling reducing of costs, recycling of a cover for covering a back face of the game board, and freely setting passage patterns, which makes it possible to visually check and take measures externally when balls are stopped, and to prevent existing of a large number of game nails between the cover and the game board. SOLUTION: The ball passage structure is formed between the game board 2 and the cover 1 covering the back face thereof. A passage part 2c opening on one side is provided on the back face of the game board 2, wherein a recessed part 2b or a projecting part extended in a specified pattern is integrally formed on the back face. The back face of the game board 2 is covered with the cover 1 with a desired space therebetween, so that a ball passage 6 is formed between the cover 1 and the passage part 2c opening on one side. The ball passage 6 is formed without requiring members other than the cover 1 and the game board 2, without interposing members between the cover 1 and the game board 2, and without applying special treatment to the cover 1.
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