Acoustic wave device and filter device

An acoustic wave device comprising:

• a piezoelectric substrate including a piezoelectric layer;
• and
• an interdigital transducer (IDT) electrode on the piezoelectric layer and including a pair of busbars and a plurality of electrode fingers;
• wherein
• the pair of busbars include a first busbar and a second busbar opposite to each other, and the plurality of electrode fingers include a plurality of first electrode fingers and a plurality of second electrode fingers, one end of each of the plurality of first electrode fingers being connected to the first busbar, one end of each of the plurality of second electrode fingers being connected to the second busbar, the plurality of first electrode fingers and the plurality of second electrode fingers being interdigitated with each other;
• a virtual line connecting tip portions of the plurality of second electrode fingers is defined as a first envelope, and a virtual line connecting tip portions of the plurality of first electrode fingers is defined as a second envelope, and a region between the first envelope and the second envelope in the IDT electrode is an intersection region;
• and
• the intersection region includes a plurality of parallel regions in which the plurality of first electrode fingers and the plurality of second electrode fingers extend in parallel and a non-parallel region in which directions in which the plurality of first electrode fingers and the plurality of second electrode fingers extend intersect each other, the plurality of parallel regions and the non-parallel region being alternately arranged in at least a portion of the intersection region, the plurality of first electrode fingers and the plurality of second electrode fingers each linearly extending in the plurality of parallel regions and the non-parallel region and each being bent at boundaries between the plurality of parallel regions and the non-parallel region.