Multi-piece solid golf ball

A multi-piece solid golf ball comprising a core, an envelope layer, an intermediate layer and a cover, wherein the core is formed of a rubber composition as one or more layer;

• the envelope layer is formed of a resin material as one or more layer;
• the intermediate layer is formed of a resin material as one layer;
• the cover is formed of a resin material as one layer having a thickness of not more than 1.0 mm;
• the Shore C hardness at a surface of the core, the Shore C hardness at a surface of the sphere obtained by encasing the core with the envelope layer (envelope layer-encased sphere), the Shore C hardness at a surface of the sphere obtained by encasing the envelope layer-encased sphere with the intermediate layer intermediate layer-encased sphere) and the Shore C hardness at a surface of the ball together satisfy the conditions (Shore C hardness at surface of envelope layer-encased sphere)>(Shore C hardness at core surface) and (Shore C hardness at surface of intermediate layer-encased sphere)>(Shore C hardness at ball surface);
• and, letting C be the deflection of the core in millimeters when compressed under a final load of 1,275 N (130 kgf) from an initial load of 98 N (10 kgf) and B be the deflection of the ball in millimeters when compressed under a final load of 1,275 N (130 kgf) from an initial load of 98 N (10 kgf), B≥3.0 and 2.5≤C−B≤4.3.