| 摘要 |
PROBLEM TO BE SOLVED: To provide a golf ball excellent in flight performance when being shot by a driver.SOLUTION: The golf ball comprises a spherical core and a cover. The core includes an inner layer core, an interlayer core and an outer layer core. Hardness H (C) is equal to or higher than hardness H (B). Hardness H (E) is equal to or higher than hardness H (D). An angle α is calculated, on the basis of thickness Y (mm) of the interlayer core, the hardness H (C) and the hardness H (D), by an expression 1: α=(180/&pgr;)×atan[{H(D)-H(C)}/Y]. An angle &bgr; is calculated, on the basis of thickness Z (mm) of the outer layer core, the hardness H (E) and the hardness H (F), by an expression 2: &bgr;=(180/&pgr;)×atan[{H(F)-H(E)}/Z]. The angle α is 0° or higher. A difference (α-&bgr;) between the angle α and the angle &bgr; is 0° or higher. |
