Patent ID: 6852468

Claim:
A positive resist composition comprising: (A) a resin capable of increasing the solubility in an alkali developer by the action of acid, in which the resin contains (A1) a repeating unit having at least one of a dihydroxyadamantyl group and a trihydroxyadamantyl group, (A2) a repeating unit containing an acid-decomposable group having an alicyclic structure, and (A3) a repeating unit having an alicyclic lactone structure; (B) a compound capable of generating an acid upon irradiation with one of an actinic ray and a radiation; and (C) a surfactant containing at least one of a fluorine atom and a silicon atom, wherein the resin (A) contains the repeating unit (A1) and the repeating unit (A2) at a composition molar ratio: A1/A2 of from 0.35 to 1.0, and a total content of the repeating unit (A1) and the repeating unit (A2) in the resin (A) is 40 to 70 mole %, and the repeating unit (A3) is a repeating unit containing a group represented by any of formulae (V-1), (V-2) and (V-4): wherein R 1b to R 5b each independently represents a hydrogen atom or an alkyl, cycloalkyl or alkenyl group, which may be substituted; and any two of R 1b to R 5b may combine with each other to form a ring.