Patent ID: 7985534

Claim:
A pattern forming method, comprising: forming a resist film by applying a resist composition containing (A) a resin capable of increasing a polarity of the resin (A) by an action of an acid, whose solubility in a positive tone developer which is an alkali developer increases and solubility in a negative tone developer containing an organic solvent decreases upon irradiation with an actinic ray or radiation, (B) a compound capable of generating an acid upon irradiation with an actinic ray or radiation and (C) a solvent, wherein solubility of the resist composition in the positive tone developer increases and solubility of the resist composition in the negative tone developer decreases upon irradiation with an actinic ray or radiation; exposing the resist film; forming a resist pattern by developing the resist film after the exposing by using the negative tone developer; and causing a crosslinked layer-forming material that forms a crosslinked layer at an interface with the resist pattern in the presence of an acid to act on the resist pattern to crosslink the resin constituting the resist pattern and the crosslinked layer-forming material, thereby forming a crosslinked layer.