Elastic wave filter, multiplexer, duplexer, high-frequency front end circuit, and communication device

An elastic wave filter comprising:

• four or more series resonators that are connected in series with each other between an input terminal and an output terminal;
• and
• a parallel resonator that is connected between any of connection nodes between the input terminal, the output terminal and the four or more series resonators, and a reference terminal;
• wherein
• frequency differences that are differences between anti-resonant frequencies and resonant frequencies of all of the series resonators except for a first series resonator that is connected so as to be closest to the input terminal and a second series resonator that is connected so as to be closest to the output terminal among the four or more series resonators are smaller than frequency differences between the anti-resonant frequencies and the resonant frequencies of the first series resonator and the second series resonator, and the anti-resonant frequencies of all of the series resonators except for the first series resonator and the second series resonator are lower than the anti-resonant frequencies of the first series resonator and the second series resonator.