A photosensitive negative resin composition comprising (a) an epoxy-group-containing compound, (b) a first onium salt containing a cation portion structure represented by and an anion portion structure represented by, and (c) a second onium salt containing a cation portion structure represented by and an anion portion structure represented by, wherein R 1 to R 3 are, independently of one another, an organic group which may be substituted and has 1 to 30 carbon atoms, with the proviso that at least two oxygen atoms are included in all the constituent atoms of R 1 to R 3, X is selected from a carbon atom, a nitrogen atom, a phosphorus atom, a boron atom and an antimony atom, Y is selected from -S(=O) 2 -, an alkylene fluoride group, -OCF 2 -, -C(=O)-CF 2 -, -O-C(=O)-CF 2 -, -C(=O)-O-CF 2 -and a single bond, R 4 is a hydrocarbon group which may be substituted by a fluorine atom and has 1 to 30 carbon atoms, and m and n are such that m + n is 3 and n is an integer selected from 0, 1 and 2 when X is the carbon atom, m + n is 2 and n is an integer selected from 0 and 1 when X is the nitrogen atom, m + n is 6 and n is an integer selected from 0 to 6 when X is the phosphorus or antimony atom, or m + n is 4 and n is an integer selected from 0 to 3 when X is the boron atom, wherein R 5 to R 7 are, independently of one another, an organic group which may be substituted and has 1 to 15 carbon atoms, with the proviso that at most one oxygen atom is included in all the constituent atoms of R 5 to R 7, Z is selected from a carbon atom and a sulfur atom, k is 1 when Z is the carbon atom, k is 2 when Z is the sulfur atom, and R 8 is a hydrocarbon group which may contain a heteroatom and has 1 to 20 carbon atoms. (a) an epoxy-group-containing compound, (b) a first onium salt containing a cation portion structure represented by and an anion portion structure represented by, and (c) a second onium salt containing a cation portion structure represented by and an anion portion structure represented by, wherein R 1 to R 3 are, independently of one another, an organic group which may be substituted and has 1 to 30 carbon atoms, with the proviso that at least two oxygen atoms are included in all the constituent atoms of R 1 to R 3, X is selected from a carbon atom, a nitrogen atom, a phosphorus atom, a boron atom and an antimony atom, Y is selected from -S(=O) 2 -, an alkylene fluoride group, -OCF 2 -, -C(=O)-CF 2 -, -O-C(=O)-CF 2 -, -C(=O)-O-CF 2 -and a single bond, R 4 is a hydrocarbon group which may be substituted by a fluorine atom and has 1 to 30 carbon atoms, and m and n are such that m + n is 3 and n is an integer selected from 0, 1 and 2 when X is the carbon atom, m + n is 2 and n is an integer selected from 0 and 1 when X is the nitrogen atom, m + n is 6 and n is an integer selected from 0 to 6 when X is the phosphorus or antimony atom, or m + n is 4 and n is an integer selected from 0 to 3 when X is the boron atom, wherein R 5 to R 7 are, independently of one another, an organic group which may be substituted and has 1 to 15 carbon atoms, with the proviso that at most one oxygen atom is included in all the constituent atoms of R 5 to R 7, Z is selected from a carbon atom and a sulfur atom, k is 1 when Z is the carbon atom, k is 2 when Z is the sulfur atom, and R 8 is a hydrocarbon group which may contain a heteroatom and has 1 to 20 carbon atoms.