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[0220] The resin (A) may include the repeating unit B singly or in combination of two or more kinds thereof. 

[0221] It is also preferable that the resin (AX!) includes the repeating units described in paragraphs [0336] to [0369] of the specification of US2016/0070167 Al as the repeating unit B. 

[0222] Furthermore, the resin (AX!) may also include the repeating unit having a group that decomposes by the action of an acid to produce an alcoholic hydroxyl group as described in paragraphs [0363] to [0364] of the specification of US2016/0070167 Al as the repeating unit B. 

[0223] A content of the repeating unit B included in the resin (AX!) (in a case where the repeating units B are present in a plural number, a total content thereof) is preferably 10% to 90% by mole, more preferably 20% to 80% by mole, and still more preferably 30% to 70% by mole, with respect to all the repeating units of the resin (AX!). 

[0224] • Repeating Unit C 

[0225] Furthermore, the resin (AX!) preferably includes a repeating unit (hereinafter also referred to as a "repeating unit C") having at least one selected from the group con› sisting of a lactone structure, a sultone structure, and a carbonate structure. 

[0226] As the lactone structure or sultone structure, any structure which has a lactone structure or sultone structure may be used, but the structure is preferably a 5- to 7-mem› bered ring lactone structure or a 5- to 7-membered ring sultone structure. Among those, the structure is more pref› erably a 5- to 7-membered ring lactone structure with which another ring structure is fused in the form of forming a bicyclo structure or a spiro structure or a 5- to 7-membered ring sultone structure with which another ring structure is fused in the form of forming a bicyclo structure or a spiro structure. 

[0227] The resin (AX!) still more preferably has a repeating unit having a lactone structure represented by 

