The present invention provides a rubber composition having a high impact resilience, and improved processability and workability which may be used for the manufacture of a one-piece solid golf ball, the solid core of multi-layered solid golf balls or the solid centre of thread-wound golf balls. The rubber composition is characterized in that the rubber component is made from a mixture of:

(1) 60 to 95 wt% of a polybutadiene containing at least more than 40% of cis-1,4-bonds and having a Mooney viscosity [ML₁₊₄(100°C)] of 50 to 70, obtained by using a lanthanum rare earth-based catalyst, nickel-based catalyst or cobalt-based catalyst, or a mixture thereof with another polybutadiene obtained by using a catalyst other than the above mentioned one, and
(2) 5 to 40 wt% of a polyisoprene containing at least more than 90% of cis-1,4-bonds and a Mooney viscosity of 70 to 90.