Patent ID: 8182368

Claim:
A golf ball comprising a core, an envelope layer positioned outside the core, a mid layer positioned outside the envelope layer, and a cover positioned outside the mid layer, wherein: the core includes a center and a core outer layer positioned outside the center; the center has a diameter of 1 mm or greater and 15 mm or less; a difference (H4−H3) between a JIS-C hardness H4 of the core at its surface and a JIS-C hardness H3 of the core outer layer at its innermost portion is equal to or greater than 10; the cover has a Shore D hardness H7 less than 40; and a Shore D hardness H5 of the envelope layer, a Shore D hardness H6 of the mid layer, and a Shore D hardness H7of the cover satisfy the following mathematical formula (I) H5>H6≧H7 (I).