Pattern forming method, multi-layered resist pattern, multi-layered film for organic solvent development, resist composition, method for manufacturing electronic device, and electronic device

A pattern forming method comprising:

• (i) a step of forming a first film on a substrate by using a first resin composition (I) containing a resin in which the content of a repeating unit having a group capable of decomposing by the action of an acid to produce a polar group is 20 mol % or less based on all repeating units in the resin,
• (ii) a step of forming a second film on the first film by using a second resin composition (II) different from the resin composition (I), in which the second resin composition (II) contains a resin having a group capable of decomposing by the action of an acid to produce a polar group and a compound capable of generating an acid upon irradiation with an actinic ray or radiation,
• (iii) a step of exposing a multi-layered film having the first film and the second film, and
• (iv) a step of developing the first film and the second film in the exposed multi-layered film by using an organic solvent-containing developer to form a negative pattern.