Patent ID: 7147987

Claim:
A positive resist composition comprising (A) a compound that generates an acid upon irradiation of an actinic ray or radiation and (B) a resin having a property of increasing solubility in an alkali developing solution by the action of an acid and including a repeating unit containing a partial structure represented by formula (X) shown below and a repeating unit represented by formula (Y) shown below: wherein R 1 to R 6 each independently represents a hydrogen atom, a fluorine atom or a fluoroalkyl group, provided that at least one of R 1 to R 6 is not a hydrogen atom, X 1 and X 2 each represents a hydrogen atom, and Z represents a monovalent organic group having at least one cyclic hydrocarbon structure; wherein R a ′, R b ′, R c ′ and R d ′ each independently represents a hydrogen atom, a fluorine atom or a fluoroalkyl group, provided that at least one of R a ′ to R d ′ is not a hydrogen atom.