Patent ID: 7749108

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 envelope layer has an inner layer and an outer layer; the core is formed primarily of a rubber material; the inner and outer envelope layers, the intermediate layer and the cover are each formed primarily of the same or different resin materials; the inner and outer envelope layers, intermediate layer and cover have thicknesses which satisfy the following conditions (i) and (ii): (i) cover thickness<intermediate layer thickness<(inner envelope layer thickness+outer envelope layer thickness) (ii) (cover thickness+intermediate layer thickness) <(inner envelope layer thickness+outer envelope layer thickness); and the core surface, inner envelope layer, outer envelope layer, intermediate layer and cover have Shore D hardnesses which satisfy the following condition (iii): (iii) core surface hardness≦inner envelope layer hardness<outer envelope layer hardness<intermediate layer hardness>cover hardness.