Elastic wave device

Abstract

This elastic wave device comprises a mounting substrate, an elastic wave element that is mounted on the mounting substrate, and a resin member that is provided to at least a portion of a surface of the elastic wave element that faces the mounting substrate. The elastic wave element is provided with a piezoelectric layer that has a first main surface and a second main surface on opposite sides from each other, an electrode that is provided to at least one of the first main surface and the second main surface of the piezoelectric layer, and a support member that is provided to the second-main-surface side of the piezoelectric layer and is provided with a cavity on the second-main-surface-side of the piezoelectric layer. The piezoelectric layer has an opening that is provided in a region overlapping an outer edge of the cavity. The support member has a side portion and a bottom portion that form the cavity, and has a plurality of protrusions that are provided to at least one of the side portion and the bottom portion in a region overlapping the opening of the piezoelectric layer.

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