Golf ball

A golf ball comprising a core and at least one cover layer covering the core, wherein

• the core is formed from a core rubber composition containing (a) a base rubber, (b) an α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms and/or a metal salt thereof as a co-crosslinking agent, and (c) a crosslinking initiator,
• a difference (crosslinking density at surface of core-crosslinking density at center of core) between a crosslinking density at a surface of the core and a crosslinking density at a center of the core is more than 1.0×102 mol/m3 and less than 9.0×102 mol/m3, and
• a hardness difference (H50−Ho) between H50 and Ho is 1.0 or more and 20.0 or less, and a hardness difference (Hs−H50) between Hs and H50 is 0 or more and 15.0 or less in Shore C hardness,
• wherein Hs (Shore C hardness) is a hardness at the surface of the core, Ho (Shore C hardness) is a hardness at the center of the core, and H50 (Shore C hardness) is a hardness at a midpoint between the center of the core and the surface of the core.