US 2020/0050106 Al  13  Feb. 13, 2020  with Leaving Group That Leaves by Action of Acid) and  (Repeating Unit Having Acid Group) as described above.  [0185]  That is, neither the structure in which a polar group  is protected with a leaving group that leaves by the action of  an acid nor the acid group is included in the repeating unit  having a fluorine atom or an iodine atom.  [0186]  As the repeating unit having a fluorine atom or an  iodine atom, a repeating unit represented by Formula  (C) is  preferable.  (C)  [0187]  L$_{5 }$ represents a single bond or an ester group.  [0188]  R$_{9 }$ represents a hydrogen atom, or an alkyl group  which may have a fluorine atom or an iodine atom.  [0189]  R$_{10 }$ represents a hydrogen atom, an alkyl group  which may have a fluorine atom or an iodine atom, a  cycloalkyl group which may have a fluorine atom or an  iodine atom, an aryl group which may have a fluorine atom  or an iodine atom, or a group formed by combination  thereof.  [0190]  The content of the repeating unit having a fluorine  atom or an iodine atom is preferably 0% to 50% by mole,  more preferably 5% to 45% by mole, and still more pref› erably 10% to 40% by mole with respect to all the repeating  units in the resin (A).  [0191]  Furthermore, from the viewpoint that (Repeating  Unit Having Structure in Which Polar Group Is Protected  with Leaving Group That Leaves by Action of Acid) and  (Repeating Unit Having Acid Group) are not included in the  repeating unit having a fluorine atom or an iodine atom as  described above, the content of the repeating unit having a  fluorine atom or an iodine atom is also intended to mean the  content of the repeating unit having a fluorine atom or an  iodine atom excluding (Repeating Unit Having Structure in  Which Polar Group Is Protected with Leaving Group That  Leaves by Action of Acid) and (Repeating Unit Having Acid  Group).  [0192]  As described above, the repeating unit having a  structure in which a polar group is protected with a leaving  group that leaves by the action of an acid may include a  fluorine atom or an iodine atom, and the repeating unit  having an acid group may also include a fluorine atom or an  iodine atom.  [0193]  Among the repeating units of the resin (A), the total  content of the repeating unit including at least one of a  fluorine atom or an iodine atom is preferably 20% to 100%  by mole, more preferably 30% to 100% by mole, and still  more preferably 40% to 100% by mole with respect to all the  repeating units of the resin (A).  [0194]  In addition, examples of the repeating unit includ› ing at least one of a fluorine atom or an iodine atom include  a repeating unit which has a fluorine atom or an iodine atom,  and has a structure in which a polar group is protected with  a leaving group that leaves by the action of an acid, and a  repeating unit which has a fluorine atom or an iodine atom,  and has an acid group, and a repeating unit having a fluorine  atom or an iodine atom.  [0195]  (Repeating Unit Having Lactone Group)  [0196]  The resin (A) may further have a repeating unit  having a lactone group.  [0197]  As the lactone group, any group may be used as  long as it has a lactone structure, but the lactone group is  preferably a group having a 5- to 7-membered ring lactone  structure, and more preferably a group having a 5- to  7-membered ring lactone structure to which another ring  structure is fused in the form of forming a bicyclo structure  or a spiro structure.  [0198]  The resin (A) more preferably has a repeating unit  having a group having a lactone structure represented by any  one of General Formulae (LCl-1) to (LCl-17). Further, the  group having a lactone structure may be bonded directly to  the main chain. As the lactone structure, a group represented  by General Formula (LCl-1), General Formula (LCl-4),  General Formula (LCl-5), General Formula (LCl-6), Gen› eral Formula (LCl-13), or General Formula (LCl-14) is  preferable.  LCl-1  LCl-2  LCl-3  LCl-4  Qt  0  LCl-5  fl  0 