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In one embodiment, a resin (Ab) preferably include at least a repeating unit represented by the following formula as a repeating unit represented by the general formula (A). 

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The content of repeating unit represented by the general formula (A) in the resin (Ab) is preferably from Oto 90% by mole, more preferably from 5 to 80% by mole, still more preferably from 10 to 70% by mole, and particularly prefer› ably from 20 to 60% by mole, based on all the repeating units in the resin (Ab). 

In one embodiment, the resin (Ab) may contain a repeating unit (B) including a structural moiety capable of decompos› ing by irradiation with actinic rays or radiation to generate an acid (hereinafter referred to as an "acid-generating repeating unit (B )" or a "repeating unit (B )"). 

The structural moiety may be, for example, a structural moiety capable of decomposing by irradiation with actinic rays or radiation to generate an acid anion in the repeating unit (B), or a structural moiety capable of discharging an acid anion to generate a cation structure in the repeating unit (B). 

Furthermore, this structural moiety is preferably, for 35 example, an ionic structural moiety including a sulfonium salt structure or an iodonium salt structure. 

This structural moiety may be, for example, the same struc› tural moiety as a structural moiety represented by A in the general formulae (Bl), (B2), and (B3) shown below. 

In one embodiment, it is preferable that the repeating unit (B) be at least one selected from the group consisting of repeating units of the following general formulae (Bl), (B2) and (B3). Among these, the repeating unit represented by the following general formula (B 1) or (B3) is more preferred, and the repeating unit represented by the following general for› mula (Bl) is particularly preferred. 

[Chem. 26] 

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In the general formulae (Bl), (B2) and (B3), 

A represents a structural moiety capable of decomposing by irradiation with actinic rays or radiation to generate an acid amon. 

R 04 , R 05 and R 07 to R 09 each independently represent a hydrogen atom, an alkyl group, a cycloalkyl group, a halogen atom, a cyano group, or an alkoxycarbonyl group. 

R 06 represents a cyano group, a carboxyl group, -CO› OR25 or-CO-N(R 26 )(R$_{27}$). R 25 represents an alkyl group, a cycloalkyl group, an alkenyl group, a cycloalkenyl group, an aryl group or an aralkyl group. R 26 and R$_{27 }$ each indepen- dently represent a hydrogen atom, an alkyl group, a cycloalkyl group, an alkenyl group, a cycloalkenyl group, an aryl group or an aralkyl group. R 26 and R$_{27 }$may be bonded to each other to form a ring together with a nitrogen atom. 

X 1 , X 2 andX 3 each independently represent a single bond, an arylene group, an alkylene group, a cycloalkylene group, ---0-, -S0 2 -, --CO-, -N(R 33 )-, or a divalent con› necting group formed by a combination of two or more of these. R 33 represents a hydrogen atom, an alkyl group, a cycloalkyl group, an alkenyl group, a cycloalkenyl group, an aryl group, or an aralkyl group. 

A represents a structural moiety capable of decomposing by irradiation with actinic rays or radiation to generate an acid anion, and specific examples thereof include a photoinitiator for photocationic polymerization, a photoinitiator for photo› radical polymerization, a photo-achromatic agent and photo› discoloring agent for coloring materials, structural moieties contained in generally known compounds that generate an acid by light, employed in microresists or the like. 

Furthermore, A is preferably an ionic structural moiety with a sulfonium salt structure or an iodonium salt structure. In particular, A is preferably any of the groups represented by the following general formulae (ZI) and (ZII). 

[Chem. 27] 

R 201 , R 202 and R 203 in the general formula (ZI) each inde› pendently represent an organic group. 

In the general formula (ZII), R 204 and R 205 each indepen› dently represent an aryl group, an alkyl group or a cycloalkyl group. 

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