the invention provides a process for producing a transparent polyactic acid material , comprising the steps of : kneading a polyactic acid with a monomer having two or more double bonds in its molecule ; molding the kneaded product at a temperature of from the melting point of the polyactic acid to 200 ° c . to obtain a molded article ; quenching the molded article after molding ; and subjecting the quenched molded article to crosslinking treatment so as to prevent molecules of the polylactic acid from undergoing recrystallization . also disclosed is a transparent polyactic acid material produced by the process .