A radiation-sensitive resin composition comprising (A) a resin containing an acid-dissociable group which is insoluble or scarcely soluble in alkali and becomes alkali soluble when the acid-dissociable group dissociates, comprising the following recurring unit (I), recurring unit (II), and at least one of the recurring units (III-1) and (III-2), and (B) a photoacid generator. The radiation-sensitive resin composition is suitable for use as a chemically-amplified resist showing sensitivity to active radiation such as deep ultraviolet rays represented by a KrF excimer laser or ArF excimer laser, exhibiting superior dry etching resistance without being affected by types of etching gas, having high radiation transmittance, exhibiting excellent basic characteristics as a resist such as sensitivity, resolution, and pattern shape, possessing excellent storage stability as a composition, and exhibiting sufficient adhesion to substrates.