Provided is a radiation-sensitive resin composition including: an alicyclic olefin polymer (A) having acidic groups; a sulfonium salt-based photoacid generator (B) represented by general formula (1) (in general formula (1): R1, R2, and R3 each independently represent a C6-30 aryl group, a C4-30 heterocyclic group, a C1-30 alkyl group, a C2-30 alkenyl group, or a C2-30 alkynyl group, and may each have a substituent; and a is an integer in the range of 1-5); and a crosslinking agent (C).