Golf ball 2 has a center 4, a mid layer 6, a reinforcing layer 8 and a cover 10. Base polymer of the mid layer 6 includes an ionomer resin as a principal component. A melting point of the resin composition is equal to or greater than 95.degree. C. The mid layer 6 has a thickness of 0.5 mm or greater and 2.5 mm or less. The cover 10 includes a thermoplastic resin. The cover 10 has a nominal thickness Tc of 0.1 mm or greater and 0.9 mm or less. The mid layer 6 has recessed parts which correspond to dimples 12. In the golf ball 2, the resin composition of the mid layer 6 does not flow out from a seam when forming the cover 10.