Patent ID: 8211616

Claim:
A positive resist composition comprising a resin component (A) which exhibits increased solubility in an alkali developing solution under action of acid and an acid-generator component (B) which generates acid upon irradiation exposure with any form of radiation, said resin component (A) comprising at least one structural unit (a0) selected from the group consisting of a structural unit represented by general formula (a0-1) shown below and a structural unit represented by general formula (a0-2) shown below, and said acid-generator component (B) comprising an acid generator (B1) consisting of a compound represented by general formula (b1) shown below: wherein, in formula (a0-1), R represents a hydrogen atom, a lower alkyl group of 1 to 5 carbon atoms or a halogenated lower alkyl group of 1 to 5 carbon atoms; R 1 represents a branched alkyl group of 3 or more carbon atoms; and each of R 2 and R 3 independently represents an alkyl group, wherein R 2 and R 3 may be mutually bonded to form a polycyclic group; and in general formula (a0-2), R represents a hydrogen atom, a lower alkyl group of 1 to 5 carbon atoms or a halogenated lower alkyl group of 1 to 5 carbon atoms; R 8 represents a divalent linking group that contains no halogen atom; and R 7 represents an acid dissociable, dissolution inhibiting group; wherein Y 1 represents a fluorinated alkylene group of 1 to 4 carbon atoms which may have a substituent; X represents an aliphatic cyclic group of 3 to 30 carbon atoms which may have a substituent; and A + represents an organic cation.