A golf ball includes a core, an inner cover formed around the core, and an outer cover formed around the inner cover. A plurality of through-holes are formed in the inner cover, projections are formed on the inner surface of the outer cover at positions corresponding to the through-holes, and the inner cover and the outer cover are joined together in a state in which the projections are received in the through-holes. The ratio a/A between an area a of the core-side end surface of each projection and an area A of the outer-cover-side end surface of the projection falls within the range of 0.04 to 0.80. The ratio s/S between a sum s of the areas A of the outer-cover-side end surfaces of the projections and a surface area S of a virtual spherical surface defined by the outer surface of the inner cover falls within the range of 0.05 to 0.75.