Patent ID: 8043168

Claim:
A golf ball which comprises a center, a mid layer positioned outside the center, and a cover positioned outside the mid layer, the base polymer of the mid layer including an ionomer resin as a principal component, the Shore D hardness H 1 s of the surface of the center being greater than the Shore D hardness H 2 of the mid layer, the Shore D hardness H 3 of the cover being equal to or greater than 57, the weight W 2 of the mid layer being greater than the weight W 3 of the cover, the total weight (W 2 +W 3 ) of the weight W 2 of the mid layer and the weight W 3 of the cover being 8.4 g or greater and less than 12.0 g, the total volume (V 2 +V 3 ) of the volume V 2 of the mid layer and the volume V 3 of the cover being equal to or less than 10.0 cm 3 , and wherein the difference (G 2 −G 1 ) between the specific gravity G 2 of the mid layer and the specific gravity G 1 of the center is equal to or greater than 0.01.