Patent ID: 8723621

Claim:
An elastic wave device comprising: a first piezoelectric substrate; a second piezoelectric substrate; a joining portion that joins the first piezoelectric substrate and the second piezoelectric substrate to each other such that the first piezoelectric substrate and the second piezoelectric substrate face each other and a cavity is provided between the first piezoelectric substrate and the second piezoelectric substrate; a first set of a plurality of filters located on one main surface of the first piezoelectric substrate, which faces the second piezoelectric substrate across the cavity; a second set of a plurality of filters located on one main surface of the second piezoelectric substrate, which faces the first piezoelectric substrate across the cavity; wherein the first set of filters and the second set of filters define a plurality of pairs of filters and face each other across the cavity; and each of absolute values of differences between center frequencies of filters of the first set of filters and filters of the second set of filters of each pair of filters is larger than a minimum value among absolute values of differences between center frequencies of pairs of filters selected from a group including the first set of filters and the second set of filters.