Patent ID: 7121959

Claim:
A multi-piece solid golf ball comprising a core consisting of an inner core and an outer core formed on the inner core, and one or more layers of cover covering the core, wherein the inner core has a diameter of 30 to 40.4 mm, a surface hardness in JIS-C hardness of 60 to 85, and a center hardness in JIS-C hardness of the inner core is lower than the surface hardness by 5 to 30, and the outer core has a thickness of 0.2 to 0.9 mm, and a surface hardness in JIS-C hardness of the outer core is lower than the surface hardness of the inner core by 2 to 30, wherein the outer core is formed from a rubber composition comprising not less than 40% of a cis-1,4 bond polybutadiene, a co-crosslinking agent, an organic peroxide and a filler.