An acoustic wave device that can achieve a good characteristic in a superhigh frequency band of 6 GHz or higher by using an overtone. The device includes: a piezoelectric substrate; an electrode provided in such a way as to be in contact with the piezoelectric substrate; and an acoustic multilayer film provided in such a way as to be in contact with the piezoelectric substrate and/or the electrode and is configured to use an overtone of resonance characteristics of a surface acoustic wave. The electrode includes an interdigital transducer provided on one of surfaces of the piezoelectric substrate. The surface acoustic wave that is the overtone preferably has a velocity of 9000 m/s or higher. The acoustic multilayer film is preferably composed of an acoustic low impedance film and an acoustic high impedance film which are alternately stacked.