This invention provides a negative photosensitive resin composition comprising a polymer that is a copolymer, a crosslinking agent and a photosensitizer. Herein, the copolymer comprises a norbornene type structural unit substituted with a functional group containing a terminal unsaturated carbon double bond, a norbornene type structural unit substituted with a carboxyl group, and a structural unit derived from maleic anhydride, maleic anhydride derivative, maleimide or maleimide derivative.
Negative photosensitive resin composition, resin film and electronic device