Abstract: A negative photosensitive resin composition containing an epoxy group-containing resin and a cationic polymerization initiator which includes a sulfonium salt represented by General Formula (I0). In Formula (I0), R1 and R2 represent an aryl group, a heterocyclic hydrocarbon group, or an alkyl group. R3 to R5 are an alkyl group, a hydroxy group, an alkoxy group, an alkylcarbonyl group, an arylcarbonyl group, an acyloxy group, an arylthio group, an alkylthio group, an aryl group, a heterocyclic hydrocarbon group, an aryloxy group, a hydroxy(poly)alkyleneoxy group, or a halogen atom. k is an integer of 0 to 4, m is an integer of 0 to 3, and n is an integer of 1 to 4. A is a group represented by —S—, —O—, —SO—, —SO2—, or —CO—.

Abstract: Provided is a non-ionic photoacid generator (A) expressed by general formula (1). R1 and R2 each independently represents an alkyl group having 1-18 carbons or a fluoroalkyl group having 1-18 carbons, an alkenyl group having 2-18 carbons, an alkynyl group having 2-18 carbons, an aryl group having 6-18 carbons, a silyl group, or the like; m and n respectively represent the number of R1s and R2s, each number being an integer from 0 to 3, and the total number (m+n) of R1s and R2s being an integer from 1 to 6. The m number of R1s and the n number of R2s may each be the same or different. R3 represents a hydrocarbon having 1-18 carbons wherein one part or all of the hydrogen may be substituted by fluorine.