Multi-piece solid golf ball

A multi-piece solid golf ball comprising a core and four successive layers encasing the core—an inner envelope layer, an outer envelope layer, an intermediate layer and a cover, wherein the inner envelope layer, the outer envelope layer and the intermediate layer are each formed of different highly neutralized resin materials;

• the cover has a larger thickness than the respective thicknesses of the inner envelope layer, the outer envelope layer and the intermediate layer;
• and the value (A)−(B) obtained by subtracting the material hardness (B) of the softest layer among the inner envelope layer, the outer envelope layer and the intermediate layer from the material hardness (A) of the cover is a Shore D hardness of 13 or more, wherein the value obtained by subtracting the core surface hardness from the surface hardness of the inner envelope layer-encased sphere, expressed in terms of the Shore D hardness, is from 0 to 10, and the material hardness of the cover on the Shore D hardness scale is at least 58, and the material hardnesses of the respective layers and the center hardness of the core satisfy the following condition:
• cover material hardness>intermediate layer material hardness>outer envelope layer material hardness>inner envelope layer material hardness>core center hardness, and
• wherein the golf ball has a five-piece construction consisting of the single core, the single inner envelope layer, the single outer envelope layer, the single intermediate layer and the single cover.