Patent ID: 8304160

Claim:
A photosensitive resin composition for an interlayer insulating film or a protective film of a substrate for circuit formation, wherein the photosensitive resin composition comprises: a polymer (a) having a structural unit shown by the formula (A), wherein R 1 is a trivalent or tetravalent organic group, R 2 is a divalent organic group, R is a monovalent organic group having a carbon-carbon unsaturated double bond or a group shown by O − M + , in which M + is a hydrogen ion or an ion of a compound having a carbon-carbon unsaturated double bond, and at least one of Rs is a monovalent organic group having a carbon-carbon unsaturated double bond or a group shown by O − M + , in which M + is an ion of a compound having a carbon-carbon unsaturated double bond, and n is 1 or 2, wherein the polymer (a) has a structural unit shown by the following formula (1), wherein R 1 , R 2 , M + and n are as defined in the formula (A); and a compound (b) that generates a radical when irradiated with active rays and that has a structure shown by the following formula (B), wherein R 3 is a monovalent aromatic or heterocyclic ring that may have a substituent.