The present invention provides a three-piece solid golf ball having a core obtained by molding under heat a specific rubber composition and having a two-layer cover and an inner cover layer and an outer cover layer which encase the core and are made of a thermoplastic resin material. By optimizing the deflection of the core under a specific load, optimizing the combined thickness of the cover layers, forming the inner cover layer of a highly neutralized ionomer resin composition, and forming the outer cover layer of a special urethane material, a sufficient reduction in the spin rate of the ball on shots taken with a driver can be achieved, enabling the distance traveled by the ball to be increased. Moreover, the golf ball of the invention has a good feel on shots taken with a driver, and has an excellent spin rate on approach shots.