A golf ball manufacturing apparatus comprises a mold including a cavity for forming a golf ball, an injection molding machine for supplying a molten resin to the mold, a supply portion for supplying a resin pellet to the injection molding machine, and a crushing machine for crushing a residue discharged from the mold, thereby fabricating a regenerating pellet. The supply portion includes a main cylinder (11), a cylinder (13) for a regenerating pellet and a cylinder (15) for a virgin pellet which branch upward. An inclination angle (u) to a vertical line of the cylinder (13) is equal to or smaller than 20 degrees. An inclination angle (f3) to a vertical line of the cylinder (15) is 30 to 60 degrees. The crushing machine is coupled to the cylinder (13), and the regenerating pellet is transferred to the main cylinder (11) through the cylinder (13).