Acoustic wave device

An acoustic wave device comprising:

• a first acoustic wave resonator including a first piezoelectric film including a first piezoelectric layer including a piezoelectric body;
• and
• at least one second acoustic wave resonator electrically connected to the first acoustic wave resonator and including a second piezoelectric film including a second piezoelectric layer made of a piezoelectric body and an IDT electrode on the second piezoelectric layer;
• wherein
• the first acoustic wave resonator includes:
• a first comb-shaped electrode on the first piezoelectric layer, including a first busbar and a plurality of first electrode fingers each including one end connected to the first busbar, and being connected to an input potential;
• a second comb-shaped electrode on the first piezoelectric layer, including a second busbar and a plurality of second electrode fingers each including one end connected to the second busbar and interdigitated with the plurality of first electrode fingers, and being connected to an output potential;
• and
• a third electrode connected to a potential different from those connected to the first comb-shaped electrode and the second comb-shaped electrode, and including a plurality of third electrode fingers on the first piezoelectric layer and aligned with the first electrode fingers and the second electrode fingers in a direction in which the first electrode fingers and the second electrode fingers are arranged in plan view, and a connection electrode connecting adjacent third electrode fingers;
• an order in which a first electrode finger, a second electrode finger, and a third electrode finger are arranged is such that, starting from the first electrode finger, the first electrode finger, the third electrode finger, the second electrode finger, and the third electrode finger define one period;
• the IDT electrode of the second acoustic wave resonator includes a plurality of fourth electrode fingers and a plurality of fifth electrode fingers interdigitated with each other;
• and
• the second acoustic wave resonator is a series arm resonator or a parallel arm resonator.