Tire rubber composition and pneumatic tire

It is an object of the present invention to provide a tire rubber composition and a pneumatic tire produced using the rubber composition, which improve mechanical strength, abrasion resistance, rolling resistance, wet grip performance, and dry grip performance in good balance. The present invention relates to a tire rubber composition comprising: a rubber component that contains a modified diene rubber; and a silica component that contains a silica surface-treated with a silane coupling agent, wherein the amount of the modified diene rubber in 100% by mass of the rubber component is 15% by mass or more, and the dispersion ratio of the silica component is 70% or higher.