To easily obtain a rubber composition capable of improving rolling resistance and wet performance in a well-balanced manner, without deteriorating abrasion resistance, by uniformly dispersing silica in a blend rubber.

This rubber composition is given by mixing 20-100 pts.wt. of the silica into 100 pts.wt. of a rubber component, wherein the rubber component comprises a styrene butadiene rubber-A (SBR-A) having a glass transition temperature of ≥ -40°C, a styrene butadiene rubber-B (SBR-B) composing a phase structure by being dispersed in a continuous phase of the SBR-A, and 5-25 pts.wt. of an isoprene polymer, and an average diameter of the phase structure composed of the SBR-B is 100-1000 nm.