RUBBER COMPOSITION AND PNEUMATIC TIRE

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A rubber composition includes a rubber component including oil-extended butadiene rubber and/or styrene-butadiene rubber, an inorganic reinforcement agent having nitrogen adsorption specific surface area of 10 to 60 m2/g, and silica and/or carbon black. The oil-extended rubber has cis content of 95 mol % or greater, vinyl content of 1.2 mol % or less and weight-average molecular weight of 530, 000 or greater and is synthesized with rare-earth catalyst. The styrene-butadiene rubber has bound styrene content of 10 to 60 mass % and weight-average molecular weight of 800, 000 or greater. The reinforcement agent has formula, mM.xSiOy.zH2O, where M represents one or more metals selected from Al, Mg, Ti, Ca, Zr, oxide of the metal thereof and hydroxide of the metal thereof, m represents whole number of 1 to 5, x represents whole number of to 10, y represents whole number of 2 to 5, and z represents whole number of 0 to 10.