A radiation-sensitive resin composition includes a resin (A1) that includes a repeating unit shown by the following formula (1-1) and a repeating unit shown by the following formula (1-2), and a radiation-sensitive acid generator (B). The radiation-sensitive resin composition exhibits excellent sensitivity, and can reduce a mask error factor (MEEF). wherein R1, R2, and R3 individually represent a linear or branched alkyl group having 1 to 4 carbon atoms, R4 represents a hydrogen atom, a linear or branched alkyl group having 2 to 4 carbon atoms, a linear or branched fluoroalkyl group having 1 to 4 carbon atoms, or a linear or branched alkoxy group having 1 to 4 carbon atoms, and q represents an integer from 0 to 3.