An acoustic wave filter having excellent steepness is provided without adding any exterior components or any new manufacturing steps. A plurality of filters (10-1) each having a first resonator (2a-1) placed in a serial arm and having a resonance frequency f.sub.rs and an anti-resonance frequency f.sub.as, and a second resonator (4a-1) placed in a parallel arm and having a resonator f.sub.rp and an anti-resonance frequency f.sub.ap are provided on a same substrate, where the resonance frequency f.sub.rs of the first resonator is higher than the resonance frequency f.sub.rp of the second resonator; the anti-resonance frequency f.sub.as of the first resonator is higher than the anti-resonance frequency f.sub.ap of the second resonator; and the filters (10-1) are connected in multiple stages. At least one of the filters (10-1) connected in multiple stages has a third resonator (6-1) having a resonance frequency f.sub.rp and an anti-resonance frequency fap. The third resonator (6-1) is formed on the substrate and connected to the serial arm in parallel with respect to the first resonator (2a-1).