Acoustic wave element, duplexer, and communication module

An acoustic wave element, comprising:

• a piezoelectric substrate;
• a signal input line;
• a signal output line;
• and
• an acoustic wave resonator on a main surface of the piezoelectric substrate, electrically connected to the signal input line and the signal output line, wherein
• the acoustic wave resonator is being divided into a first IDT electrode and a second IDT electrode which is electrically connected to the first IDT electrode,
• the first IDT electrode comprises a first comb-shaped electrode on a first signal input line side with respect to electrical connection and a second comb-shaped electrode on a first signal output line side with respect to electrical connection, the first signal input line side being a side of the first IDT electrode where the signal input line electrically couples with the first IDT electrode and the first signal output line side being a side of the first IDT electrode where the signal output line electrically couples with the first IDT electrode,
• the second IDT electrode comprises a third comb-shaped electrode on a second signal input line side with respect to electrical connection and a fourth comb-shaped electrode on a second signal output line side with respect to electrical connection, the second signal input line side being a side of the second IDT electrode where the signal input line electrically couples with the second IDT electrode and the second signal output line side being a side of the second IDT electrode where the signal output line electrically couples with the second IDT electrode,
• a direction of arrangement from the third comb-shaped electrode toward the fourth comb-shaped electrode is different from a direction of arrangement from the first comb-shaped electrode toward the second comb-shaped electrode, the directions of arrangement being directions with respect to the piezoelectric substrate.