An acoustic wave device 1 includes a piezoelectric substrate 2 including a first surface 2A and a second surface 2B, a support substrate 6 bonded to the second surface 2B of the piezoelectric substrate 2, and a first filter 10a and a second filter 10b a passband of which is higher than that of the first filter, both being on the first surface 2A of the piezoelectric substrate 2. The first filter 10a and the second filter 10b each includes an IDT electrode 3. A thickness of the IDT electrode 3 of the first filter 10a and a thickness of the IDT electrode 3 of second filter 10b are different.