A photosensitive resin composition is provided which is excellent in water developability, impact resilience, resin plate strength after exposure, breaking extension, and resin-plate transparency. The composition comprises: (1) a granular copolymer produced by polymerizing a monomer mixture comprising: (i) an aliphatic conjugated diene monomer; (ii) a monomer expressed by the general formula (I): ##STR1## (in which R.sup.1 represents a hydrogen atom or a methyl group, R.sup.2 represents an alkylene group having a carbon number of 3 to 20, and l represents an integer of 1 to 20); (iii) a monomer having at least two addition-polymerizable groups, and (iv) an addition-polymerizable monomer other than (i), (ii) and (iii), if desirable; (2) a photo-polymerizable unsaturated monomer; (3) an amino group-containing compound, and (4) a photo-polymerization initiator.