Golf ball mold

A golf ball mold comprising upper and lower portions having a large number of projections for dimple formation on cavities thereof,

• wherein each of the upper and lower portions includes a convex section and a concave section which are alternately provided such that a joining surface to the other has a concavo-convex shape,
• each of the numbers of the convex sections of the upper portion, the concave sections of the upper portion, the convex sections of the lower portion and the concave sections of the lower portion is three to five,
• each of the convex sections has two to eight projections on a first line from the joining surface, and
• at least one of the projections on the first line from the joining surface in each of the convex sections is constituted such that an equation (I) is established:
• R×0.8≦L≦R×1.2 (I)
• (In the equation (I), R represents a radius of the projection and L represents a linear distance in a vertical direction between a center of the projection and the joining surface).