Acoustic wave element, filter element, and communication device

An acoustic wave element, comprising:

• a piezoelectric substrate;
• and
• an IDT electrode which is located on an upper surface of the piezoelectric substrate and excites an acoustic wave, wherein
• the IDT electrode comprises
• a first bus bar and a second bus bar which face each other in a direction crossing a propagation direction of the acoustic wave,
• a plurality of first electrode fingers which extend from the first bus bar to a side of the second bus bar, and
• a plurality of second electrode fingers which extend from the second bus bar to a side of the first bus bar and have portions that are adjacent to the plurality of first electrode fingers in the propagation direction, and
• a first imaginary line connecting end portions of the plurality of first electrode fingers in the IDT electrode of the side of the second bus bar, and
• a second imaginary line connecting end portions of the plurality of second electrode fingers in the IDT electrode of the side of the first bus bar are within ranges of
• 2 degrees<θA≦10 degrees and
• 2 degrees<θB≦10 degrees
• where an angle formed by the first imaginary line and the propagation direction is the first inclination angle θA and an angle formed by the second imaginary line and the propagation direction is the second inclination angle θB.