Patent ID: 8124310

Claim:
A positive resist composition, comprising: (A) a resin containing a repeating unit represented by formula (I), of which solubility in an alkali developer increases under an action of an acid; and (B) a compound capable of generating an acid upon irradiation with actinic rays or radiation: wherein Ra and Rb each represents a hydrogen atom; Z represents an alkyl group, an alkoxy group, a halogen atom, a cyano group, a nitro group, an acyl group, an acyloxy group, a cycloalkyl group, a carboxyl group, an alkyloxycarbonyl group, an alkylcarbonyloxy group or an aralkyl group; Z 1 represents an aryl group which is a non-acid-decomposable group having absorption at least at 248 nm and which does not contain a sulfonium salt structure; Y represents a single bond, —O—, —S—, —C(═O)—, —C(═O)O— or —NH; and k represents an integer of 0 to 4, n represents an integer of 1 to 5, provided that 1≦k+n≦5, when a plurality of Z′s, Y′s or Z 1 ′s are present, the plurality of Z′s, Y′s or Z 1 ′s may be the same or different, and when a plurality of Z 1 ′s are present, the plurality of Z 1 ′s may combine with each other to form a ring.