The present invention provides a multi-piece 
solid golf ball having 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. 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):cover thickness<intermediate 
layer thickness<(
inner envelope layer thickness+outer envelope 
layer thickness)  (i)(cover thickness+intermediate layer thickness)<(
inner envelope layer thickness+outer envelope layer thickness).  (ii)The 
inner envelope layer, outer envelope layer, intermediate layer and cover have 
Shore D hardnesses which satisfy the following condition (iii):inner envelope layer 
hardness<outer envelope layer 
hardness<intermediate layer 
hardness>cover hardness.  (iii)The 
total thickness of the envelope layer is at least 2.0 mm but not more than 10.0 mm.The 
golf ball has an outstanding flight performance and 
controllability which are acceptable to professionals and other skilled players, in addition to which it has an excellent durability to 
cracking under repeated 
impact and an excellent scuff resistance.