The invention provides a golf ball having a core and a cover of one or more layer encasing the core, wherein, letting HU-A and HU-B be respectively the Martens hardnesses measured at positions 100 μm and 200 μm inward from a surface of an outermost layer of the cover and toward a center of the core, and letting HU-C be the Martens hardness measured at a position 100 μm from an inner side of the outermost cover layer and toward the surface, HU-A or HU-B is harder than HU-C.