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[0403] (Cation) 

[0404] The compound Y is preferably the onium salt compound, and more preferably a sulfonium salt compound of the anion represented by General Formula (dla), General Formula (d2a), General Formula (PA-Ia), General Formula (PA-Ila), or General Formula (PA-Illa) with a sulfonium cation, or an iodonium salt compound of the anion repre› sented by General Formula (dla), General Formula (d2a), General Formula (PA-Ia), General Formula (PA-Ila), or General Formula (PA-Illa) with an iodonium cation, 

[0405] The sulfonium cation of the sulfonium salt com› pound is preferably represented by General Formula (ZT) and the iodonium cation of the iodonium salt compound is preferably represented by General Formula (ZII), 

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[0406] In General Formula (ZI), 

[0407] R$_{201}$, R 202 , and R $_{203 }$each independently represent an organic group, 

[0408] The organic group as each ofR$_{201}$ , R 202 , and R 203 preferably has 1 to 30 carbon atoms, and more preferably has 1 to 20 carbon atoms, 

[0409] In addition, two of R$_{201 }$ to R$_{203 }$may be bonded to each other to form a ring structure and the ring may include an oxygen atom, a sulfur atom, an ester bond, an amide bond, or a carbonyl group, Examples of the group formed by the bonding of two ofR$_{201 }$to R$_{203 }$include an alkylene group (for example, a butylene group and a pentylene group), 

[0410] Examples of the organic group of each of R$_{201}$ , R$_{202}$, and R$_{203 }$include an aryl group, an alkyl group, and a cycloalkyl group, 

[0411] It is preferable that at least one of R$_{201}$, R 202 , or R$_{203 }$ is an aryl group, and it is more preferable that all of R$_{201}$, R 202 , and R 203 represent an aryl group, As the aryl 

-continued 

group, not only a phenyl group, a naphthyl group, or the like but also a heteroaryl group such as an indole residue and a pyrrole residue can also be used, 

[0412] As the alkyl group of each of R$_{201 }$to R$_{203}$ , a linear or branched alkyl group having 1 to 10 carbon atoms is preferable, and a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, or the like is more preferable, 

[0413] As the cycloalkyl group of each of R$_{201 }$ to R$_{203}$ , a cycloalkyl group having 3 to 10 carbon atoms is preferable, and a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, a cyclohexyl group, or a cycloheptyl group is more preferable, 

[0414] Examples of the substituent which may be con› tained in such the groups include a nitro group, a halogen atom such as a fluorine atom, a carboxyl group, a hydroxyl group, an amino group, a cyano group, an alkoxy group (preferably having 1 to 15 carbon atoms), a cycloalkyl group (preferably having 3 to 15 carbon atoms), an aryl group (preferably 6 to 14 carbon atoms), an alkoxycarbonyl group (preferably 2 to 7 carbon atoms), an acyl group (preferably 2 to 12 carbon atoms), an arylcarbonyl group (preferably having 7 to 15 carbon atoms), an alkylarylcarbonyl group (preferably having 8 to 18 carbon atoms), a cycloalkylsul› fonyl group, and an alkoxycarbonyloxy group (preferably having 2 to 7 carbon atoms), Further, the substituent may have an acid-decomposable group, 

[0415] In General Formula (ZII), 

[0416] R$_{204 }$to R$_{205 }$ each independently represent an aryl group, an alkyl group, or a cycloalkyl group, 

[0417] The aryl group, the alkyl group, and the cycloalkyl group of each of R$_{204 }$and R$_{205 }$ are the same as the groups described as the aryl group, the alkyl group, and the cycloalkyl group of each of R$_{201 }$ to R$_{203}$ , respectively, in General Formula (ZI), 

[0418] Examples of the substituents which may be con› tained in the aryl group, the alkyl group, and the cycloalkyl group of each of R$_{204 }$ and R$_{205 }$ include the substituents which may be contained in the aryl group, the alkyl group, and the cycloalkyl group of each of R$_{201 }$ to R$_{203 }$ in the above-mentioned General Formula (ZI), 

[0419] As the compound Y, a compound represented by General Formula (PAI) or (PA2) is preferable, 

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[0420] In General Formula (PAI), 

[0421] R’$_{20}$$^{i, R’}$202, and R’$_{203 }$each independently represent an organic group, and specifically, are the same as R$_{201}$ , R$_{202}$, and R$_{203 }$in Formula (ZI), 

[0422] x- represents an anion, The anion is preferably an anion represented by General Formula (dla), (d2a), (PA-Ia), (PA-II), or (PA-Ila), 

