RUBBER COMPOSITION AND PNEUMATIC TIRE

The present invention provides a rubber composition that enables to improve the fuel economy, wet-grip performance, abrasion resistance, and processability in a balanced manner, and a pneumatic tire including the rubber composition. The present invention relates to a rubber composition containing silica and a conjugated diene polymer, the conjugated diene polymer being obtained by reacting a compound containing a nitrogen atom and/or a silicon atom with an active end of a copolymer obtained by polymerizing a monomer component including a conjugated diene compound and a silicon-containing vinyl compound using a polymerization initiator represented by the following formula (I): wherein an amount of the conjugated diene polymer is not more than 90% by mass based on 100% by mass of a rubber component of the rubber composition, and an amount of the silica is 10 to 150 parts by mass per 100 parts by mass of the rubber component.