Acoustic wave filter

An acoustic wave filter comprising:

• at least one parallel arm resonator disposed between a ground and a path connecting two input/output terminals;
• wherein
• each of the at least one parallel arm resonator is an acoustic wave resonator including an interdigital transducer electrode provided on a substrate with piezoelectricity;
• an anti-resonant frequency of the at least one parallel arm resonator is positioned within a pass band of the acoustic wave filter;
• the interdigital transducer electrode includes a pair of comb-shaped electrodes, each of the comb-shaped electrodes including a plurality of electrode fingers and a busbar electrode, the plurality of electrode fingers extending in a direction intersecting a propagation direction of acoustic waves and being disposed in parallel or substantially in parallel with each other, one end of one of the plurality of electrode fingers and one end of another electrode finger of the plurality of electrode fingers being connected with each other by the busbar electrode;
• among the plurality of electrode fingers, an electrode finger which is connected to neither of the busbar electrodes is defined as a withdrawal-weighted floating electrode;
• and
• among the at least one parallel arm resonator, a parallel arm resonator with the highest resonant frequency is a first parallel arm resonator, and the interdigital transducer electrode of the first parallel arm resonator includes two or more of the withdrawal-weighted floating electrodes, the two or more of the withdrawal-weighted floating electrodes being disposed without any of the plurality of electrode fingers of one of the comb-shaped electrodes interposed therebetween.