Multi-piece solid golf ball

A multi-piece solid golf ball comprising a core, an envelope layer, an intermediate layer and a cover, the core being formed of a rubber composition as one or more layer, the envelope layer being formed of a resin material as one or more layer and the intermediate layer and the cover each being formed of a resin material as a single layer,

• wherein
• the core has a diameter of from 35.1 to 41.3 mm;
• the core has a hardness profile in which, letting Cc be the Shore C hardness at a center of the core, Cm be the Shore C hardness at a midpoint M between the core center and a surface of the core, Cm−2, Cm−4 and Cm−6 be the respective Shore C hardnesses at positions 2 mm, 4 mm and 6 mm inward from the midpoint M, Cm+2, Cm+4 and Cm+6 be the respective Shore C hardnesses at positions 2 mm, 4 mm and 6 mm outward from the midpoint M and Cs be the Shore C hardness at the core surface and defining the surface areas A to F as follows
• surface area A:
• ½×2×(Cm−4−Cm−6)
• surface area B:
• ½×2×(Cm−2−Cm−4)
• surface area C:
• ½×2×(Cm−Cm−2)
• surface area D:
• ½×2×(Cm+2−Cm)
• surface area E:
• ½×2×(Cm+4−Cm+2)
• surface area F:
• ½×2×(Cm+6−Cm+4),
• (surface area E+surface area F)−(surface area A+surface area B) has a value of 1.0 or more and Cs−Cc has a value of 20 or more;
• the intermediate layer is formed primarily of an ionomer resin material including a high-acid ionomer resin;
• the center hardness of the core, surface hardness of the core, surface hardness of the sphere obtained by encasing the core with the envelope layer (envelope layer-encased sphere), surface hardness of the sphere obtained by encasing the envelope layer-encased sphere with the intermediate layer (intermediate layer-encased sphere) and surface hardness of the ball have Shore C hardness relationships therebetween which satisfy the following conditions:
• core surface hardness<surface hardness of envelope layer-encased sphere<surface hardness of intermediate layer-encased sphere>ball surface hardness, and (1)
• (surface hardness of envelope layer-encased sphere)−(center hardness of core)≥28:
• (2)
• and the intermediate layer and the cover have respective thicknesses which satisfy the following condition:
• cover thickness<intermediate layer thickness. (3)