Patent ID: 8906600

Claim:
A resist pattern forming method, comprising: in the following order, (1) a step of forming a film on a substrate by using a positive resist composition; (2) a step of exposing the film; and (4) a step of performing development by using an alkali developer after the exposing, wherein the positive resist composition contains (A) a polymer compound having a repeating unit represented by the following formula (I), a thickness of the film formed in the step (1) is from 15 to 40 nm, and an alkali component concentration in the alkali developer is from 0.5 to 1.1 mass %: wherein each of R 01 , R 02 and R 03 independently represents a hydrogen atom, an alkyl group, a cycloalkyl group, a halogen atom, a cyano group or an alkoxycarbonyl group, R 03 and Ar 1 may combine to form a 5- or 6-membered ring and in this case, R 03 represents an alkylene group; Ar 1 represents an (n+1)-valent aromatic ring group and in the case of combining with R 03 to form a ring, represents an (n+2)-valent aromatic ring group; n represents an integer of 1 to 4; and each of n number of Y's independently represents a group capable of leaving by an action of an acid, said group being a structure represented by formula (II): wherein in formula (II), each of L 1 and L 2 independently represents a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group or an aralkyl group; M represents a single bond or a divalent linking group; Q represents an alkyl group, a cycloalkyl group, an alicyclic group, an aromatic ring group, an amino group, an ammonium group, a mercapto group, a cyano group or an aldehyde group, provided that the alicyclic group and the aromatic ring group may contain a heteroatom; and at least two members of Q, M and L 1 may combine with each other to form a 5- or 6-membered ring.