Solid golf ball

A solid golf ball comprising a solid core and a cover layer that encases the core and has an outermost layer on an outside surface of which are formed a plurality of dimples, wherein the solid core is formed of a rubber composition composed of 100 parts by weight of a base rubber that includes from 60 to 100 parts by weight of a polybutadiene rubber having a cis-1,4 bond content of at least 60% and synthesized using a rare-earth catalyst, from 0.1 to 5 parts by weight of an organosulfur compound, an unsaturated carboxylic acid or a metal salt thereof, an inorganic filler, and an antioxidant;

• the solid core has a deformation, when compressed under a final load of 130 kgf from an initial load of 10 kgf, of from 2.0 to 4.0 mm, and has the hardness distribution shown in the table below;
• the cover layer is formed by injection molding a single resin blend composed primarily of (A) a polyurethane material and (B) a polyisocyanate compound, which resin blend includes a polyisocyanate compound in at least some portion of which all the isocyanate groups on the molecule remain in an unreacted state;
• the cover layer has a thickness of from 0.5 to 2.5 mm and a Shore D hardness at the surface of from 50 to 70;
• and the golf ball has a deformation, when compressed under a final load of 130 kgf from an initial load of 10 kgf, of from 2.0 to 3.8 mm
• Hardness Distribution in Solid Core
• Shore D hardness
• Center
• 30 to 48
• Region located 5 mm from center
• 34 to 52
• Region located 10 mm from center
• 40 to 58
• Region located 15 mm from center (Q)
• 43 to 61
• Region located 2 to 3 mm inside of surface (R)
• 36 to 54
• Surface (S)
• 41 to 59
• Hardness difference [(Q) − (S)]
• 1 to 10
• Hardness difference [(S) − (R)]
• 3 to 10.