A polyurea resin composition for RIM or coating use Comprises (a) a polyoxyalkylenepolyamine, (b) an aromatic polyamine and/or a xylylenediamine and (c) a polyisocyanate compound with either one or both of components (a) and (b) having been modified by a Michael reaction with a vinyl monomer having an electron attracting group to convert the primary amino group thereof to a secondary amino group. The composition also contains as an internal mold release a polyoxyalkylene glycol mono-C.sub.4 -C.sub.1, alkyl ether and/or as a polyamine component a reaction product between a primary aromatic polyamine and a polyglycidyl ether.