Disclosed is a resin comprising a structural unit derived from a compound represented by formula (I) and a structural unit having an acid-labile group: wherein R1 represents a hydrocarbon group which may have a substituent, R2 each independently represent an alkyl group which may have a halogen atom, a hydrogen atom or a halogen atom, Ar represents an aromatic hydrocarbon group which may have a substituent, L1 represents a group represented by formula (L1-1), etc., L11, L13, L15 and L17 each independently represent an alkanediyl group, L12, L14, L16 and L18 each independently represent —O—, —CO—, —CO—O—, etc., * and ** are bonds, and ** represents a bond to an iodine atom.