Rubber composition for tire, and pneumatic tire

A rubber composition for a tire, comprising:

• a diene polymer;
• silica;
• and
• a compound represented by formula (I) below,
• the diene polymer being a modified diene polymer obtained by reacting a component (A) with a component (B),
• an amount of the compound represented by the formula (I) being 0.1 to 10 parts by mass per 100 parts by mass of a rubber component of the rubber composition,
• the component (A) being an active alkali metal-terminated conjugated diene polymer obtained by polymerizing a conjugated diene monomer alone or with an aromatic vinyl monomer, in the presence of a component (C),
• the component (B) being a modifying agent containing a functional group, and
• the component (C) being a chemical species obtained by reacting an organic alkali metal compound with a compound represented by the following formula (1):
• wherein R1 and R2 are the same as or different from each other and each represents a hydrogen atom, a branched or unbranched alkyl group, a branched or unbranched aryl group, a branched or unbranched alkoxy group, a branched or unbranched silyloxy group, a branched or unbranched acetal group, a carboxyl group, a mercapto group, or a derivative thereof;
• and A represents a branched or unbranched alkylene group, a branched or unbranched arylene group, or a derivative thereof;
• wherein y1, y2, and y3 are the same as or different from each other and each represents an integer of 2 to 40.