Filter device, multiplexer, radio-frequency front end circuit, and communication device

A filter device comprising:

• a first series arm resonator and a second series arm resonator electrically connected in series between a first terminal and a second terminal, the first series arm resonator being located on a side closer to the first terminal, the second series arm resonator being located on a side closer to the second terminal;
• a parallel arm resonator electrically connected between a ground and a series arm between the first series arm resonator and the second series arm resonator;
• a first inductor electrically connected in parallel to the first series arm resonator and the second series arm resonator;
• and
• a matching circuit electrically connected between the second series arm resonator and the second terminal or between the first series arm resonator and the first terminal;
• wherein
• the first series arm resonator, the second series arm resonator, and the parallel arm resonator define a pass band of a bandpass filter;
• the first series arm resonator, the second series arm resonator, and the first inductor define an LC resonant circuit;
• respective anti-resonant frequencies of each of the first series arm resonator and the second series arm resonator and a resonant frequency of the parallel arm resonator are located in a pass band of the LC resonant circuit;
• and
• a resonant frequency of the LC resonant circuit is lower than the resonant frequency of the parallel arm resonator.