Patent ID: 7968276

Claim:
A method of forming a resist pattern, comprising: applying a first positive resist composition on a substrate to form a first resist film on the substrate; selectively exposing said first resist film and alkali-developing said first resist film to form a first resist pattern; applying a second positive resist composition on said substrate on which said first resist pattern is formed to form a second resist film; and selectively exposing said second resist film and alkali-developing said second resist film to form a resist pattern, wherein said second positive resist composition is a positive resist composition comprising a resin component (A) which exhibits increased solubility in an alkali developing solution under action of acid, an acid-generator component (B) which generates acid upon exposure, and an organic solvent (S), said resin component (A) and said acid-generator component (B) being dissolved in the organic solvent (S), and said organic solvent (S) is an organic solvent which does not dissolve said first resist film; and said resin component (A) has a structural unit (a0-1) represented by general formula (a0-1) shown below and a structural unit (a0-2) represented by general formula (a0-2) shown below: wherein R represents a hydrogen atom, a lower alkyl group or a halogenated lower alkyl group; Y 1 represents an aliphatic cyclic group; Z represents a tertiary alkyl group-containing group or an alkoxyalkyl group; a represents an integer of 1 to 3; b represents an integer of 0 to 2 and a+b=1 to 3; c, d and e each independently represents an integer of 0 to 3; and wherein R represents a hydrogen atom, a lower alkyl group or a halogenated lower alkyl group; Y 3 represents an alkylene group or an aliphatic cyclic group; g and h each independently represents an integer of 0 to 3; and i represents an integer of 1 to 3.