Acoustic wave filter

An acoustic wave filter comprising:

• a plurality of longitudinally coupled resonators;
• wherein
• the plurality of longitudinally coupled resonators includes a first longitudinally coupled resonator and a second longitudinally coupled resonator that are connected to each other;
• each of the first longitudinally coupled resonator and the second longitudinally coupled resonator includes three IDT electrodes that include a plurality of electrode fingers extending in a first direction along a main surface of a substrate and aligned in a second direction intersecting the first direction;
• the first longitudinally coupled resonator includes the three IDT electrodes provided along the second direction, a first IDT electrode of the three IDT electrodes is at a center in the second direction, and a second IDT electrode of the three IDT electrodes is adjacent to the first IDT electrode;
• the second longitudinally coupled resonator includes the three IDT electrodes provided along the second direction, a third IDT electrode of the three IDT electrodes is at a center in the second direction, and a fourth IDT electrode is adjacent to the third IDT electrode;
• each of the IDT electrodes includes a wide pitch electrode finger group with a pitch equal to or larger than a mean value of pitches of the plurality of electrode fingers, and a narrow pitch electrode finger group with a pitch less than the mean value;
• and
• a number of the electrode fingers included in the wide pitch electrode finger group of the first IDT electrode is smaller than a number of the electrode fingers included in the wide pitch electrode finger group of the third IDT electrode by a percentage within a range of equal to or more than about 4.2% and equal to or less than about 23.5%;
• and/or
• a number of the electrode fingers included in the wide pitch electrode finger group of the second IDT electrode is smaller than a number of the electrode fingers included in the wide pitch electrode finger group of the fourth IDT electrode by a percentage within a range of equal to or more than about 9.5% and equal to or less than about 52.4%.