Vibration-damping material with excellent workability

A vibration-damping material with excellent workability consisting of two metal plates and a vibration-damping layer of a thermoplastic resin interposed between the two metal plates, in which the vibration-damping layer of a thermoplastic resin has a total thickness of 30 to 100.mu. and consists of a film as a middle layer and a polyolefin type resin (B) provided on both sides of the film as an upper and lower layer, the middle layer being composed of (1) at least one resin (A) selected from the group consisting of an ethylene-vinyl acetate copolymer, an ethylene-acrylic acid copolymer and a saponification product of an ethylene-vinyl acetate copolymer each having a modulus of elasticity in shear at 20.degree. C. of 3.times.10.sup.9 to 1.times.10.sup.7 dyne/cm.sup.2, a percentage of elongation at 20.degree. C. of 50% or above and a peak temperature of dissipation factor (tan .delta.) of -120.degree. to 80.degree. C. or (2) a resin mixture of the resin (A) and a synthetic rubber having a percentage of elongation at 20.degree. C. of 100% or above and a peak temperature of dissipation factor (tan .delta.) of -120.degree. to 50.degree. C., and the polyolefin type resin (B) being selected from the group consisting of a mixture of a modification product of a linear low density polyethylene with maleic anhydride and (meth)acrylic acid ester polymer, or a mixture of said mixture and a linear low density polyethylene, said mixtures having a modulus of elasticity in shear at 20.degree. C. larger than that of the resin (A), a percentage of elongation at 20.degree. C. of 10% or above, a peak temperature of dissipation factor (tan .delta.) of -40.degree. to 180.degree. C. and a bonding strength toward the metal plates at 20.degree. C. and 180.degree.-peeling of 3 kg/cm or above.