A photosensitive composition according to claim 1, wherein the ingredient (A) is made by coagulating an emulsion of the copolymer, as-obtained by copolymerization, with a coagulant selected from the group consisting of a tertiary amine, a quaternary ammonium salt and an amine compound represented by the following formula (2): ##STR5## wherein R3 is a hydrocarbon group, R4 and R5 independently repr