| 摘要 |
A method for producing a golf ball including a spherical elastic inner layer having a large number of projections with a round shape or a polygonal shape when viewed two-dimensionally on the outer surface with a predetermined space, and a thermoplastic resin outer layer covering the inner layer. The method employs a mold including an upper mold and a lower mold with a spherical cavity formed in the inside and a parting surface provided at a position corresponding to an equator of the spherical cavity, with pole sections of the upper mold and the lower mold each provided with a plurality of columnar support pins elongating into the cavity reciprocally movably. In the method, the inner layer is supported at the cavity center portion of the mold by the support pins from above and below at the outer surface space position, and an external layer resin is injected into the space between the inner layer and the cavity wall surface so as to integrally form the inner and outer layers.
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