A method for grinding a surface of a golf ball and removing the thin outer layer thereof, wherein grinding tools arranged on three axes on a plane which axes radiate from a definite point at intervals of 120.degree. between one another are used. Each of the grinding tools possesses a circular grinding face which gradually spreads toward the end and contacts a surface of a golf ball. The grinding tools turn on the respective axes toward the same direction at the same speed keeping the same distance from the definite point.