Acoustic wave device

An acoustic wave device comprising:

• a piezoelectric film including first and second main surfaces facing each other;
• a first IDT electrode provided on the first main surface of the piezoelectric film;
• and
• a second IDT electrode provided on the second main surface of the piezoelectric film;
• wherein
• a crystal c-axis of the piezoelectric film is tilted with respect to a direction normal to the first and second main surfaces of the piezoelectric film;
• the first IDT electrode and the second IDT electrode at least partially face each other with the piezoelectric film interposed therebetween;
• each of the first and second IDT electrodes includes two comb-shaped electrodes interdigitated with each other, each of the comb-shaped electrodes including a plurality of electrode fingers and a busbar to which the plurality of electrode fingers are connected;
• a direction of an electric field generated between the busbar and end portions of the electrode fingers facing the busbar in the first IDT electrode and a direction of an electric field generated between the busbar and end portions of the electrode fingers facing the busbar in the second IDT electrode are opposite directions;
• the first IDT electrode includes first and second comb-shaped electrodes, the first comb-shaped electrode including a plurality of first electrode fingers and a first busbar to which the plurality of first electrode fingers are connected, the second comb-shaped electrode including a plurality of second electrode fingers and a second busbar to which the plurality of second electrode fingers are connected;
• the second IDT electrode includes third and fourth comb-shaped electrodes, the third comb-shaped electrode including a plurality of third electrode fingers and a third busbar to which the plurality of third electrode fingers are connected, the fourth comb-shaped electrode including a plurality of fourth electrode fingers and a fourth busbar to which the plurality of fourth electrode fingers are connected;
• and
• regarding an electrode finger of the first IDT electrode and an electrode finger of the second IDT electrode which overlap each other with the piezoelectric film interposed therebetween, a potential of the electrode finger of the first IDT electrode and a potential of the electrode finger of the second IDT electrode are the same potential.