Abstract: This invention relates to a rubber composition which has an excellent processability but also improves a storage modulus (G?) and loss tangent (tan ?) at a low temperature and further improves a wear resistance, and more particularly to a rubber composition characterized by compounding more than 1 part by mass but less than 30 parts by mass of a low-molecular weight polymer component (B) having an amount of an aromatic vinyl compound bonded of less than 30 mass % and a weight average molecular weight as converted to polystyrene of 0.2×104-8.0×104 and not less than 5 parts by mass of a filler (C) based on 100 parts by mass of a high-molecular weight polymer component (A) having an amount of an aromatic vinyl compound bonded of not more than 80 mass % and a weight average molecular weight as converted to polystyrene of not less than 1.