| abstract |
A golf ball 2 includes a core 4 , a mid layer 6 , and a cover 8 . A difference DH in hardness between a surface and a central point of the core 4 , a thickness Tm and a hardness Hm of the mid layer 6 , a thickness Tc and a hardness Hc of the cover 8 , and an amount of compressive deformation Sb of the golf ball 2 meet the following mathematical formulas (DH*Hm)/(Hc*Tc)>80 and ((Sb*Tc)/(Hc*Hm*Tm))*1000>0.75. A hardness Hc of the cover 8 is equal to or less than 40. A material of the cover 8 is a resin composition. The resin composition includes a polyurethane (A) and a polyrotaxane (B). |