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bomyl group, a tetracyclodecanyl group, a tetracyclododeca› nyl group, and an adamantyl group. 

An embodiment where Rx 1 is a methyl group or an ethyl group, and Rx 2 and Rx 3 are bonded to each other to form the above-described cycloalkyl group is preferable. 

The respective groups above may have a substituent, and examples of the substituent include an alkyl group (having 1 to 4 carbon atoms), a halogen atom, a hydroxyl group, an alkoxy group (having 1 to 4 carbon atoms), a carboxyl group and an alkoxycarbonyl group (having 2 to 6 carbon atoms), and the number of carbon atoms is preferably 8 or less. 

In another embodiment, the resin (Ab) preferably contains at least one kind of repeating units represented by the follow› ing general formulae (Al) and (A2) 

[Chem. 9] 

In the general formula (Al), 

R 61 , R 62 and R 63 each independently represent a hydrogen atom, an alkyl group, a cycloalkyl group, a halogen atom, a cyano group or an alkoxycarbonyl group. However, R 62 may be bonded to Ar 6 to form a ring, and in this case, R 62 repre› sents a single bond or an alkylene group. 

X 6 represents a single bond, --COO-, or ----CONR 64 -. 

R 64 represents a hydrogen atom or an alkyl group. 

L 6 represents a single bond or an alkylene group. 

Ar 6 represents a (n+ 1 )-valent aromatic ring group and in a case of being bonded to R 62 to form a ring, represents a (n+2)-valent aromatic ring group. 

In a case of n= 1, Y 2 represents a group leaving by the action of an acid and in a case of n2:2, Y/s each independently represent a hydrogen atom or a group leaving by the action of an acid. However, at least one of Y 2 ’ s represents a group leaving by the action of an acid. 

n represents an integer of 1 to 4. 

The general formula (Al) will be described in more detail. 

Examples of the alkyl group of R 61 to R 63 in the general formula (Al) preferably include an alkyl group having 20 or less carbon atoms such as a methyl group, an ethyl group, a propyl group, an isopropyl group, an n-butyl group, a sec› butyl group, a hexyl group, a 2-ethylhexyl group, an octyl group, a dodecyl group, which may have a substituent, and more preferably include an alkyl group having 8 or less car› bon atoms. 

Examples of the alkyl group included in analkoxycarbonyl group are preferably the same as an alkyl group ofR 61 to R 63 described above. 

A cycloalkyl group may be a monocyclic type or polycy› clic type and preferably include a monocyclic type cycloalkyl 

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group having 3 to 8 carbon atoms such as a cyclopropyl group, a cyclopentyl group, a cyclohexyl group, which may have a substituent. 

Examples of the halogen atom include a fluorine atom, a chlorine atom, a bromine atom and an iodine atom and a fluorine atom is more preferable. 

In a case where R 62 is bonded to Ar 6 to form a ring, R 62 represents a single bond or an alkylene group. Examples of the alkylene group in this case preferably include an alkylene group having 1 to 8 carbon atoms such as a methylene group, an ethylene group, a propylene group, a butylene group, a hexylene group and an octylene group, which may have a substituent. As a ring in which R 62 is bonded to Ar 6 to form, a 5-membered ring or a 6-membered ring is preferable. 

Examples of the alkyl group in R 64 in ----CONR 64 - (R 64 represents a hydrogen atom or an alkyl group) represented by X 6 include the same as an alkyl group ofR 61 to R 63 . 

As X6, a single bond, -COO-and----CONH- are pref- erable and a single bond and --COO- are more preferable. 

Examples of the alkylene group in L 6 preferably include a an alkylene group having 1 to 8 carbon atoms such as a methylene group, an ethylene group, a propylene group, a butylene group, a hexylene group and an octylene group, which may have a substituent. 

Ar 6 represents a (n+ 1 )-valent aromatic ring group. A diva› lent aromatic ring group may have a substituent in a case where n is 1 and, for example, an arylene group having 6 to 18 carbon atoms such as a phenylene group, a tolylene group, a naphthylene group or, for example, a divalent aromatic ring group including a hetero ring such as thiophene, furan, pyr› role, benzothiophene, benzofuran, benzopyrrole, triazine, imidazole, benzimidazole, triazole, thiadiazole or thiazole is included as a preferred example. 

Specific examples of the (n+l)-valent aromatic ring group in a case where n is an integer of 2 or more suitably include a group where arbitrary (n+l) hydrogen atoms are removed from specific examples in divalent aromatic ring groups described above. 

The (n+l)-valent aromatic ring group may further have a substituent. 

Examples of the substituent which an alkyl group, a cycloalkyl group, an alkoxycarbonyl, an alkylene group and (n+l)-valent aromatic ring group can have described above, include an alkyl group, a cycloalkyl group, an aryl group, an amino group, an amido group, a ureido group, a urethane group, a hydroxyl group, a carboxyl group, a halogen atom, an alkoxy group, a thioether group, an acyl group, an acyloxy group, an alkoxycarbonyl group, a cyano group, a nitro group or the like and the number of carbon atoms of the substituent is preferably 10 or less. 

n is preferably 1 or 2 and more preferably 1. 

n Y2’ s each independently represent a hydrogen atom or a group leaving by the action of an acid. However, at least one of n represents a group leaving by the action of an acid. 

Examples ofY2 of the group leaving by the action of an acid include -C(R 36 )(R 37 )(R 38 ), ----C(=O)-O----C(R 36 ) (R37)(R3s), -C(Ro1)(Ro2)(OR39), -C(Ro1)(Ro2)----C $^{(=O)-O----C(R}$36)(R 37 )(R 38 ), ----CH(R 36 )(Ar), or the like. 

In the formulae, R 3 6 to R 3 8 each independently represent an alkyl group, a cycloalkyl group, a monovalent aromatic ring group, a group formed by a combination of an alky lene group and a monovalent aromatic ring group, or an alkenyl group. $^{R}$36 and R 37 may be bonded to each other to form a ring. 

R 01 and R 02 each independently represent a hydrogen atom, an alkyl group, a cycloalkyl group, a monovalent aro- 

