Acoustic wave filter device and method of manufacturing acoustic wave filter device

A method of manufacturing an acoustic wave filter device including a plurality of resonators, the method comprising:

• forming a first chip including a first piezoelectric layer and a first temporary substrate;
• forming a second chip including a second piezoelectric layer and a second temporary substrate;
• joining the first chip and the second chip to a main surface of a support including a support substrate with a thickness in a first direction;
• and
• removing the first and second temporary substrates of the first chip and the second chip joined to the support;
• wherein the plurality of resonators include a first resonator in the first piezoelectric layer and a second resonator in the second piezoelectric layer;
• the first piezoelectric layer includes a first piezoelectric film and a second piezoelectric film laminated on the first piezoelectric film;
• a polarization direction of the first piezoelectric film differs from a polarization direction of the second piezoelectric film;
• and
• a number of piezoelectric films included in the second piezoelectric layer is smaller than a number of the piezoelectric films included in the first piezoelectric layer.