To provide a golf ball improved in the mold releasing property of the inner core thereof from a mold without hindering the performance of the golf ball, and to provide a manufacturing method thereof.

This golf ball contains the Mg vulcanized rubber powder cross- linked by the unsaturated magnesium carboxylate and other vulcanized rubber powder cross-linked by the co-crosslinker except for the unsaturated magnesium carboxylate in the inner core thereof, and the manufacturing method of this golf ball is provided. A ratio α/β between the blending quantity α of the Mg vulcanized rubber powder and the blending quantity β of other vulcanized rubber powder is set at 1/4-4, and the blending quantity α+β of the whole of the vulcanized rubber powder is desirably set at 5-30 mass parts in relation to 100 mass parts of the basic material rubber of the inner core.