Provided is a rubber composition for a tire tread, which includes 1 or greater parts by mass and less than 20 parts by mass of a millable silicone rubber compound per 100 parts by mass of a diene rubber, wherein the millable silicone rubber compound has a storage modulus of 0.3 to 10 kPa at a 450% shear strain at 110° C. and a glass transition temperature and a plasticity with a relationship: 14000