A photosensitive resin composition comprising a photosensitive saponified poly(vinyl acetate) derivative containing in the backbone thereof at least one of a first group of photosensitive units which are represented by the general formula (I) ##STR1## wherein represents a vinyl alcohol residue in the backbone of the saponified poly(vinyl acetate) derivative; Y represents a member selected from the group consisting of the following general formulae (II) and (III) ##STR2## m denotes an integer of 1-6; n denotes 0 or 1; R.sub.1 represents a member selected from a hydrogen atom, an unsubstituted alkyl and an unsubstituted aralkyl group, a hydroxyl group, a carbamoyl group, an ether bond and an unsaturated bond; R.sub.2 represents a member selected from a hydrogen atom and a lower alkyl group; and X.sup.- represents an anion, and at least one of a second group of photosensitive units having an ethylenic unsaturated double bond which are represented by the general formulae (IV) and (V) ##STR3## wherein ##STR4## is as defined above; R.sub.3 represents a member selected from a hydrogen atom, a lower alkyl group, a nitrophenyl group, a halogen atom, an aminophenyl group and a phenyl group; R.sub.4, R.sub.5 and R.sub.6 respectively represent a member selected from a hydrogen atom, a lower alkyl atom, a halogen and a phenyl group; and t.sub.1 represents 0 or 1.