To provide a chemical polymerization catalyst comprising a combination of an organic peroxide and a reductive substance, having high polymerization activity and excellent storage stability, causing little color change of a cured material, and less susceptible to water.

There is provided a chemical polymerization catalyst containing (A) a hydroperoxide-type organic peroxide and (B) an imine compound, specifically N-cyclohexyl-cyclohexanimine, N-(2-methylpropyl)cyclohexanimine, etc., or an enamine compound, concretely 1-pyrrolidino-1-cyclohexene, 1-piperidino-1-cyclohexene, 1-morpholino-1-cyclohexene, 1-morpholino-1-cyclopentene, etc.