Patent ID: 8916333

Claim:
A radiation-sensitive resin composition comprising: a polymer that includes a first structural unit shown by a formula (a1), a second structural unit shown by a formula (a2), and a third structural unit having a lactone structure; and a photoacid generator, a content of the first structural unit in the polymer being 50 mol % or more based on total structural units included in the polymer, wherein R 1 represents a hydrogen atom or a methyl group, and each of R 2 , R 3 , and R 4 independently represents an alkyl group having 1 to 10 carbon atoms or a monovalent alicyclic hydrocarbon group having 4 to 20 carbon atoms, or R 2 represents an alkyl group having 1 to 10 carbon atoms or a monovalent alicyclic hydrocarbon group having 4 to 20 carbon atoms, and R 3 and R 4 taken together represent a divalent alicyclic hydrocarbon group having 4 to 20 carbon atoms together with the carbon atom bonded to R 3 and R4, wherein R 5 represents a hydrogen atom or a methyl group, R 6 represents a single bond or a divalent hydrocarbon group having 1 to 10 carbon atoms, and A represents a trivalent organic group.