The invention provides a high-grip tire rubber composition excellent in steering stability, rolling resistance performance and abrasion resistance, and a tire tread, a bead filler, a tire belt and a pneumatic tire which each partially include the composition. The high-grip tire rubber composition includes 100 parts by mass of a solid rubber (A), the solid rubber (A) including not less than 60 mass % of a styrene butadiene rubber with 20 mass % or more styrene content, 0.1 to 90 parts by mass of a modified liquid diene rubber (B) having a functional group derived from a silane compound with a specific structure, and 20 to 150 parts by mass of a filler (C), the modified liquid diene rubber (B) satisfying the following (i) and (ii): (i) the weight average molecular weight (Mw) is 15,000 to 120,000, and (ii) the vinyl content is not more than 70 mol %.