Golf ball 2 has a spherical core 4, a mid layer 6 covering this core 4, a
reinforcing layer 8 covering this mid layer 6, and a cover 10 covering
this reinforcing layer 8. Base polymer of this mid layer 6 includes an
ionomer resin as a principal component. Base polymer of this cover 10
includes a thermoplastic polyurethane elastomer as a principal component.
The cover 10 has a thickness Tc of equal to or less than 0.6 mm. The
cover 10 has a hardness Hc as measured with a Shore D type hardness scale
of equal to or less than 54. The cover 10 has a volume V of equal to or
less than 3.0 cm.sup.3. A product obtained by multiplying the thickness
Tc, the hardness Hc and the volume V is equal to or less than 90. The
reinforcing layer 8 includes a thermosetting resin as a base polymer. The
reinforcing layer has a thickness of 3 .mu.m or greater and 50 .mu.m or
less.