NOVELTY - Ethylene-alpha-olefin and non-conjugated diene copolymerized rubber has intrinsic viscosity of 3 dl/g or more. The mass ratio of ethylene unit and alpha-olefin unit is 45/55-80/20. The mass% of ethylene unit with respect to ethylene unit of whole copolymerized rubber contained in macromolecular area and alpha-olefin unit, is larger than the ethylene unit of rubber contained in low molecular weight area and alpha-olefin unit.    USE - As blend material for vibration-proof rubber (claimed), such as engine mount and muffler hanger, hoses diaphragm, roll, radiator hose, air hose and hose covers, stickers such as packing, gasket, weather strip, O-ring, oil seal, and industrial goods such as belt, lining, dust boot, and components such as civil engineering building materials, fuel cell, electronic component, aircraft and motor vehicles.    ADVANTAGE - The rubber composition has excellent workability, high intensity and small compression. The composition provides vibration proof rubber having static dynamic ratio, expansion fatigue and antiwear quality. The composition forms low oil-extended-rubber blend material with excellent physical properties.    DETAILED DESCRIPTION - Ethylene-alpha-olefin and non-conjugated diene copolymerized rubber has intrinsic viscosity of 3 dl/g or more, measured at 135 degrees C using decalin. The mass ratio of ethylene unit and alpha-olefin unit is 45/55-80/20. The number average molecular weight of copolymer rubber is 1.5x10 power 5. The ratio of weight average molecular weight and number average molecular weight of the rubber is 5 or less. The mass% of ethylene unit with respect to the ethylene unit of whole copolymerized rubber component contained in 3x10 power 6-1x10 power 7 macromolecular area and alpha-olefin unit, is larger than the mass% of ethylene unit with respect to ethylene unit of copolymerized rubber contained in 2x10 power 4-1x10 power 5 low molecular weight area and alpha-olefin unit, by 3% or more.    INDEPENDENT CLAIMS are also included for the following:    (1) rubber blend material; and    (2) vibration proof rubber.