Abstract: This invention relates to a multi-layered, multi-piece golf ball that comprises a core, an intermediate layer, and a cover, wherein the core comprises a spherical body and ribs that are arranged on the surface of the spherical body and that have almost the same height as the thickness of the intermediate layer, wherein the intermediate layer fills a plurality of concave portions formed on the surface of the spherical body while being surrounded by the ribs. This arrangement enables the golf ball to have both high ball bounce resilience and a soft feel when hit.

Abstract: A method for manufacturing a multi-piece golf ball provided with a core material and an outer layer molded on the surface of the core material, which comprises the steps of: i) simultaneously molding a pair of semispherical outer-layer-pieces that are composed of a composition containing semi-vulcanized rubber; ii) inserting a separately molded core material between the pair of outer-layer-pieces, and bringing the mouths of the pair of outer-layer-pieces into contact; and iii) vulcanizing the rubber contained in the outer-layer-pieces by press molding to obtain an outer layer that comprises a rubber composition on the surface of the core material.