Patent ID: 8657704

Claim:
A golf ball comprising a core, a mid layer situated on the external side of the core, and a cover situated on the external side of the mid layer, wherein: said core comprises a zone “A” away from the central point of the core at a distance of 1 mm or greater and less than 5 mm and said core comprises a zone “B” away from the central point of the core at a distance of 5 mm or greater and 10 mm or less, the proportion of the volume of the core relative to the volume of the phantom sphere of the golf ball is no less than 76%; the JIS-C hardness Hc of the cover is less than the JIS-C hardness Ho of the central point of the core; at all points Pa included in said zone “A”, the following mathematical expression (I) is satisfied: Ha 2 −Ha 1<5 (I), wherein Ha 1 represents a JIS-C hardness at a point Pa 1 that is located inside the point Pa along the radial direction and away from the point Pa at a distance of 1 mm, and Ha 2 represents the JIS-C hardness at a point Pa 2 that is located outside the point Pa along the radial direction and away from the point Pa at a distance of 1 mm; and at any point Pb included in said zone “B”, the following mathematical expression (II) is satisfied: Hb 2 −Hb 1≧5 (II), wherein Hb 1 represents the JIS-C hardness at a point Pb 1 that is located inside the point Pb along the radial direction and away from the point Pb at a distance of 1 mm, and Hb 2 represents a JIS-C hardness at a point Pb 2 that is located outside the point Pb along the radial direction and away from the point Pb at a distance of 1 mm.