The developability of a positive-working photosensitive composition comprising (a) an o-quinonediazide compound is enhanced by incorporating (b) a condensed resin containing a condensation unit composed of an aromatic compound having a carboxylic group and a phenolic ahydroxyl group, and an aldehyde or ketone. Said condensation unit has preferably the formula:
wherein n is 1 or 2, R, is hydrogen, hydroxyl, acyloxy, alkyl, alkoxy, halogen, which may be the same or different when n is 2; and R 2 and R 3 , which may be the same or different, are each hydrogen, alkyl having 1 to 4 carbon atoms, phenyl or substituted phenyl.