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The repeating unit (R3) is preferably represented by at least one formula selected from the group consisting of the follow› ing formulae (I-1) to (I-10). This repeating unit is more pref› erably represented by at least one formula selected from the group consisting of the following formulae (I-1) to (I-3), still more preferably represented by the following formula (I-1). 

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In the formulae, each Ra independently represents a hydro› gen atom, an alkyl group or a group represented by ----CH 2 - O-Ra2, wherein Ra 2 represents a hydrogen atom, an alkyl group or an acyl group. 

R$_{1 }$ represents a (n+l)-valent organic group. 

R 2 represents, whenm2:2, each independently represents, a single bond or a (n+ 1 )-valent organic group. 

Each OP independently represents the above-described group capable of decomposing by the action of an acid to produce an alcoholic hydroxy group, and when n2:2 and/or m2:2, two or more OP’ s may combine with each other to form a ring. 

W represents a methylene group, an oxygen atom or a sulfur atom, 

n and m represent an integer of 1 or more. Incidentally, in the case where R 2 in formula (I-2), (I-3) or (I-8) represents a single bond, n is 1. 

1 represents an integer of 0 or more. 

L$_{1 }$ represents a linking group represented by --COO-, ---OCO-, -CONH-, ---0-, -Ar-, -SO$_{3}$ - or -SO 2 NH-, wherein Ar represents a divalent aromatic ring group. 

Each R independently represents a hydrogen atom or an alkyl group. 

R$_{0 }$ represents a hydrogen atom or an organic group. 

L$_{3 }$ represents a (m+2)-valent linking group. 

RL represents, whenm2:2, each independently represents, a (n+l)-valent linking group. 

Rs represents, when p2:2, each independently represents, a substituent, and when p2:2, the plurality of Rss may combine with each other to form a ring. 

p represents an integer of0 to 3. 

Ra represents a hydrogen atom, an alkyl group or a group represented by ----CH 2 ---0-Ra 2 . Ra is preferably a hydro- gen atom or an alkyl group having a carbon number ofl to 10, more preferably a hydrogen atom or a methyl group. 

W represents a methylene group, an oxygen atom or a sulfur atom.Wis preferably a methylene group or an oxygen atom. 

R$_{1 }$ represents a (n+l)-valent organic group. R$_{1 }$ is prefer› ably a non-aromatic hydrocarbon group. In this case, R$_{1 }$may be a chain hydrocarbon group or an alicyclic hydrocarbon group. R$_{1 }$is more preferably an alicyclic hydrocarbon group. 

R 2 represents a single bond or a (n+l)-valent organic group. R 2 is preferably a single bond or a non-aromatic hydro› carbon group. In this case, R 2 may be a chain hydrocarbon group or an alicyclic hydrocarbon group. 

In the case where R$_{1 }$ and/or R 2 are a chain hydrocarbon group, the chain hydrocarbon group may be a linear or branched-chain hydrocarbon group. The carbon number of the chain hydrocarbon group is preferably from 1 to 8. For example, when R$_{1 }$and/or R 2 are an alkylene group, R$_{1 }$and/or 

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