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Specific examples of structural units represented by gen› eral formula (all-0-15) include structural units represented by the aforementioned formulas (al-1-4) to (al-1-6) and (al- 1-34) which were described above as specific examples of the structural unit represented by general formula (al-1). 

Examples of structural units represented by general for› mula (all-1-2) include structural units represented by the aforementioned formulas (al-3) and (al-4), and a structural unit represented by formula (al-3) is particularly preferable. 

As a structural unit represented by general formula (al 1- 1-2), those in which Y 2 is a group represented by the afore› mentioned formula - Y$^{21}$---0-Y 22 - or - Y $^{21}$----C (=O)-O-Y$^{22}$-is particularly desirable. 

Preferable examples of such structural units include a structural unit represented by general formula (al-3-01) shown below, a structural unit represented by general formula (al-3-02) shown below, and a structural unit represented by general formula (al-3-03) shown below. 

[Chemical Formula 52] 

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In the formulas, R is the same as defined above; R $^{13 }$rep› resents a hydrogen atom or a methyl group; R $^{14 }$represents an alkyl group; e represents an integer of 1 to 10; and n’ repre› sents an integer of 0 to 6. 

[Chemical Formula 53] 

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In the formula, R is as defined above; each ofY 2 ’ and Y 2 " independently represents a divalent linking group; X’ repre› sents an acid dissociable group; and w represents an integer of $^{20 }$ 0~3. ~ 

In general formulas (al-3-01) and (al-3-02), R$^{13 }$is prefer› ably a hydrogen atom. 

R$^{14 }$is the same as defined for R$^{14 }$in the aforementioned formulas (1-1) to (1-9). 

e is preferably an integer of 1 to 8, more preferably 1 to 5, still more preferably 2 to 5, particularly preferably 1 or 2, and most preferably 2. 

n’ represents an integer of 1 to 6, preferably an integer of 0 to 3, more preferably 1 or 2, and most preferably 2. 

Specific examples of structural units represented by gen› eral formula ( al-3-01) include structural units represented by the aforementioned formulas (al-3-25) and (al-3-26). 

Specific examples of structural units represented by gen› eral formula (al-3-02) include structural units represented by the aforementioned formulas (al-3-27) and (al-3-28). 

In general formula (al-3-03), as the divalent linking group for Y 2 ’ and Y 2 ", the same groups as those described above for Y $^{2 }$in general formula (al-3) can be used. 

As Y 2 ’, a divalent hydrocarbon group which may have a substituent is preferable, a linear aliphatic hydrocarbon group is more preferable, and a linear alkylene group is still more preferable. Among linear alkylene groups, a linear alkylene group of 1 to 5 carbon atoms is preferable, and a methylene group or an ethylene group is particularly desirable. 

As Y 2 ", a divalent hydrocarbon group which may have a substituent is preferable, a linear aliphatic hydrocarbon group is more preferable, and a linear alkylene group is still more preferable. Among linear alkylene groups, a linear alkylene group of 1 to 5 carbon atoms is preferable, and a methylene group or an ethylene group is particularly desirable. 

As the acid dissociable group for X’, the same groups as those described above can be used. X’ is preferably a tertiary alkyl ester-type acid dissociable group, more preferably the aforementioned group (i) in which a substituent is bonded to the carbon atom to which an atom adjacent to the acid disso› ciable group is bonded to on the ring skeleton of a monovalent aliphatic cyclic group to form a tertiary carbon atom. Among these, a group represented by the aforementioned general formula (1-1) is particularly desirable. 

w represents an integer of Oto 3, preferably an integer of 0 to 2, more preferably 0 or 1, and most preferably 1. 

As the structural unit represented by general formula (al- 3-03 ), a structural unit represented by general formula ( a 1-3- 03-1) or (al-3-03-2) shown below is preferable, and a struc› tural unit represented by general formula (al-3-03-1) is particularly desirable. 

[Chemical Formula 54] 

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