| abstract |
(57) [Summary] (With correction) [SOLUTION] A solid core has 60 cis-1,4 bonds. % Or more and 2% or less of 1,2 vinyl bonds, the viscosity η (mPa · s) of a 5% by mass toluene solution at 25 ° C. is 600 or less, and the Mooney viscosity (ML 1 +4 (100 ℃) Is A, and the ratio (Mw / Mn) between the weight average molecular weight (Mw) and the number average molecular weight (Mn) is B, polybutadiene satisfying the relationship of 10 × B + 5 ≦ A ≦ 10 × B + 60. Rubber composition comprising a predetermined amount of an unsaturated carboxylic acid and / or a metal salt thereof, an organic sulfur compound, an inorganic filler, and an organic peroxide, based on a base rubber containing the same and another diene rubber. Is formed at A multi-piece solid golf ball, wherein the outer cover has a higher Shore D hardness than the inner cover. [Effect] The multi-piece solid golf ball has a soft and good hit feeling and very excellent flight performance. |