Patent ID: 7625302

Claim:
A multi-piece solid golf ball comprising a core, an envelope layer encasing the core, an intermediate layer encasing the envelope layer, and a cover which encases the intermediate layer and has formed on a surface thereof a plurality of dimples, wherein the core is composed overall of an inner layer and an outer layer which are each formed primarily of a rubber material, the outer core layer being harder than the inner core layer; and the envelope layer, intermediate layer and cover have respective thicknesses which satisfy the condition cover thickness<intermediate layer thickness<envelope layer thickness, and have respective material hardnesses (Shore D) which satisfy the condition envelope layer material hardness<intermediate layer material hardness>cover material hardness, wherein the value represented by (JIS-C hardness of envelope layer surface—JIS-C hardness of core surface) in JIS-C hardness units is at least 0 but not more than 20.