A process for the production of a photochromic product of curing by mixing a mixture comprising a polyfunctional (meth)acrylate monomer (e.g., crude polyalkylene glycol dimethacrylate containing impurities) and a photochromic spiro-oxazine compound with a compound having at least one epoxy group in the molecule (e.g., glycidyl methacrylate) and polymerizing the mixture thus obtained. This process can give a photochromic product of curing which little suffers from initial discoloration and is excellent in initial chromophoric activity.