TREAD RUBBER COMPOSITION AND TIRE

A tread rubber composition and a tire that have excellent block chipping resistance and wear resistance are provided. The tread rubber composition contains a rubber component including an isoprene-based rubber, a butadiene rubber, and a styrene-butadiene rubber, and a carbon black having an average particle diameter not greater than 20 nm and/or a cetyltrimethylammonium bromide adsorption specific surface area not less than 130 m2/g, an amount of the isoprene-based rubber in 100% by mass of the rubber component is not less than 56% by mass, and the rubber composition satisfies hardness (Hs) ≥ 72 and elongation at break (EB) ≥ 420%.