Multi-piece solid golf ball

A multi-piece solid golf ball comprising a solid core and a cover of at least two layers enclosing the core and having a number of dimples in the surface of a cover outer layer, wherein

• said solid core is formed of a rubber base and has a specific gravity of at least 1.00,
• said cover is formed of a thermoplastic resin and the cover outer layer has a greater specific gravity than the core and a cover inner layer,
• the golf ball has an inertia moment (M) within the range given by the following expression:
• M.sub.DL .ltoreq.M.ltoreq.M.sub.UL
• wherein M.sub.UL =0.08D+84.8 and M.sub.DL =0.08D+77.8 wherein D is a Shore D hardness of the cover,
• the dimples occupy at least 60% of the ball surface,
• and V.sub.0 which is the ratio of the volume of the dimple space below a plane circumscribed by the dimple edge to the volume of a cylinder whose bottom is the plane and whose height is the maximum depth of the dimple from the bottom is in the range of 0.4 to 0.65.