| 摘要 |
PROBLEM TO BE SOLVED: To provide a golf ball 2 that has excellent flight performance and controllability.SOLUTION: A golf ball 2 includes a core 4, a mid layer 6, a reinforcing layer 8, and a cover 10. The core 4 includes a center 12 and an envelope layer 14. The center 12 is molded by crosslinking a rubber composition. The rubber composition includes base material rubber (a), a co-crosslinking agent (b), a crosslinking initiator (c), and an acid and/or a salt (d). The co-crosslinking agent (b) is: (b1) an α, &bgr;-unsaturated carboxylic acid having 3 to 8 carbon atoms; or (b2) a metal salt of an α, &bgr;-unsaturated carboxylic acid having 3 to 8 carbon atoms. A Shore D hardness Hm of the mid layer 6 is greater than a Shore D hardness Hc of the cover 10. |
