Patent ID: 7741008

Claim:
A positive resist composition comprising a resin component (A) which exhibits increased alkali solubility under an action of an acid, and an acid generator component (B) which generates an acid upon exposure, wherein the resin component (A) contains a polymer compound (A1) containing a structural unit (a0) represented by general formula (a0) shown below: (wherein R represents a hydrogen atom, a halogen atom, a lower alkyl group, or a halogenated lower alkyl group; Y 1 represents an aliphatic cyclic group; Z represents an acid dissociable, dissolution inhibiting group containing a tertiary alkyl group; a represents an integer from 1 to 3, b represents an integer from 0 to 2, and a+b=1 to 3; c, d and e each represents, independently, an integer from 0 to 3), and a structural unit (a2) derived from an acrylate ester containing a lactone-containing cyclic group.