Elastic wave resonator, elastic wave filter, and antenna sharing device using the same

An elastic wave resonator includes: a first elastic wave resonator (100) having a first interdigital transducer electrode (110) arranged on the upper surface of a piezoelectric substrate (1); and a second elastic wave resonator (200) having a second interdigital transducer (210) arranged on the upper surface of the piezoelectric substrate (1). The first elastic wave resonator (100) is connected to the second elastic wave resonator (200). The intersection width between a plurality of first comb-shaped electrodes (112) constituting the first elastic wave resonator (100) is greater than the intersection width of a plurality of second comb-shaped electrodes (212) constituting the second elastic wave resonator (200). This can disperse the lateral mode spurious generation frequency, which in turn reduces the loss.