| abstract |
The present invention is a multi-piece solid golf ball having a core, a surrounding layer, an intermediate layer, and a cover, wherein the core is formed of a rubber material, and has a diameter of 31 mm or more, from the core center to the core surface. The hardness gradually increases, the hardness difference between the core center and the core surface is 15 or more in JIS-C, and the average value of the cross-sectional hardness between the core center and the position 15 mm away from the core center is (I), When the cross-sectional hardness at a position 7.5 mm away from the surface is (II), the difference in hardness (I)-(II) is within ± 2 in JIS-C, and the envelope layer and the intermediate layer are the same or different. A golf ball in which the resin material is formed as a main material, the cover is formed from a thermoplastic resin or a thermoplastic elastomer as a main material, and the thickness and surface hardness of the envelope layer, the intermediate layer, and the cover satisfy a predetermined relationship. I will provide a. [Effect] The present invention has excellent flying and controllability that can be satisfied by professionals and advanced players, and has excellent durability against cracking and abrasion resistance upon repeated impacts. [Selection] Figure 1 |