Patent ID: 7160208

Claim:
A three-piece solid golf ball comprising a core inner layer formed of a rubber composition, a core outer layer enclosing the core inner layer and formed of another rubber composition, and a cover enclosing the core outer layer and formed mainly of a polyurethane elastomer, wherein said core inner layer has a JIS-C hardness of 50 to 85, said core outer layer has a JIS-C hardness of 70 to 90, the difference between the JIS-C hardness H0 of said core outer layer at its surface and the JIS-C hardness H1 of said core inner layer at its center, given as H0-H1, is 20 to 30 units, said cover has a Shore D hardness of 46 to 55 and a gage of 1.1 to 2.1 mm, and wherein said core inner layer has a specific gravity of more than 1.0, said core outer layer has a specific gravity which is equal to or greater than that of said core inner layer, and said cover has a specific gravity which is highest among others.