| 摘要 |
PROBLEM TO BE SOLVED: To mitigate impacts by balls dropped from a ball tray and to reduce noise. SOLUTION: A hollow part 4 is formed inside the bottom surface 2 at least one of the bottom surface 2 and peripheral surface 3 of a ball box main body 1 molded by a synthetic resin material, whose upper surface is opened, and thus an impact mitigation structure is obtained.
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