Patent ID: 7367901

Claim:
A multi-piece solid golf ball comprising a multilayer core having at least an inner core layer and an outer core layer, one or more cover layer which encloses the core, the golf ball being characterized in that at least one cover layer is made primarily of an ionomer resin, the following hardness conditions (1) to (3) are satisfied: ( JIS - C hardness of cover)−( JIS - C hardness at center of core)≧27, (1) 23≦(JIS-C hardness at surface of core)−(JIS-C hardness at center of core)≦40, (2) and 0.50≦[(deflection amount of entire core)/(deflection amount of inner core layer)]≦0.75, (3) the inner core layer has an outside diameter of at least 15 mm but not more than 28 mm, and the ball has an initial velocity of at least 76.8 m/s.