The photosensitive composition as claimed in claim 1, wherein the resin (B) contains: at least one repeating unit selected from 2-alkyl-2-adamantyl(meth)acrylate and dialkyl(1-adamantyl)methyl(meth)acrylate, wherein the alkyl group is a straight chain or branched alkyl group having from 1 to 4 carbon atoms; at least one repeating unit having a lactone structure; and at least one repeating unit hav