Patent ID: 8461940

Claim:
An elastic wave device comprising: a substrate; a vibrating portion located on a first main surface of the substrate; a pad located on the first main surface of the substrate and electrically connected to an electrode of the vibrating portion; a supporting layer having a thickness larger than a thickness of the vibrating portion and arranged on the first main surface of the substrate so as to enclose the vibrating portion; a sheet-shaped cover layer composed of resin including synthetic rubber and arranged on the supporting layer so as to cover the vibrating portion and to define a hollow space around a periphery of the vibrating portion; a protective layer composed of resin having resistance to flux and arranged on a top surface of the cover layer remote from the supporting layer, the protective layer being disposed only on the top surface of the cover layer such that the protective layer does not contact the substrate; a via conductor extending through the protective layer, the cover layer, and the supporting layer and being connected to the pad; and an external electrode including a solder bump and located at an end of the via conductor adjacent to the protective layer.