Abstract: An organic damping material which by itself has excellent damping properties without being combined with other material(s), need not have a certain thickness or volume for ensuring sufficient damping performance, and is easy to process. It is characterized by comprising a polymer matrix phase and a phase dispersed therein comprising one or two or more compounds selected among-(p-toluenesulfonylamido)diphenylamine, 4,4?-bis(?,?-dimethylbenzyl)diphenylamine, octylated diphenylamine, 2,2?-methylenebis(4-ethyl-6-tert-butylphenol, 4,4?-thiobis(3-methyl-6-tert-butylphenol.