| 摘要 |
A multi-piece solid golf ball is composed of a multilayer core having at least an inner core layer and an outer core layer, one or more cover layer which encloses the core, and numerous dimples formed on a surface of the cover layer. The golf ball is characterized in that at least one cover layer is made primarily of an ionomer resin, the following hardness conditions (1) to (3) are satisfied: <?in-line-formulae description="In-line Formulae" end="lead"?>(JIS-C hardness of cover)-(JIS-C hardness at center of core)>=27, (1)<?in-line-formulae description="In-line Formulae" end="tail"?> <?in-line-formulae description="In-line Formulae" end="lead"?>23<=(JIS-C hardness at surface of core)-(JIS-C hardness at center of core)<=40, and (2)<?in-line-formulae description="In-line Formulae" end="tail"?> <?in-line-formulae description="In-line Formulae" end="lead"?>0.50<=[(deflection amount of entire core)/(deflection amount of inner core layer)]<=0.75, (3)<?in-line-formulae description="In-line Formulae" end="tail"?> the number of dimples is from 250 to 390 dimples, and the ball has an initial velocity of at least 76.8 m/s. These features enable the ball to travel a longer distance.
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