RUBBER COMPOSITION AND PNEUMATIC TIRE

The present invention provides a rubber composition capable of improving fuel economy and wet grip performance while maintaining good processability, abrasion resistance and handling stability or improving them, as well as a pneumatic tire including the rubber composition. The rubber composition contains carbon black, silica, and a polymer mixture obtained by modifying a polymer derived from a conjugated diene compound and/or an aromatic vinyl compound with a compound containing an ester group and/or a carboxyl group, the polymer mixture having a weight average molecular weight of from 1.0 × 10to 1.0 × 10, the rubber composition having a tanδ peak temperature of -20°C or higher, a rubber hardness of from 63 to 75, and a tanδ at 70°C of from 0.15 to 0.45.