| 摘要 |
An elastic wave device has a structure that prevents flux from flowing into a hollow space of the device during mounting of the device using solder bumps. The elastic wave device includes a substrate, a vibrating portion located on a first main surface of the substrate, pads located on the first main surface of the substrate and electrically connected to electrodes of the vibrating portion, a supporting layer 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 disposed on the supporting layer so as to form a hollow space around the periphery of the vibrating portion, a protective layer composed of resin having resistance to flux and disposed on a side of the cover layer remote from the supporting layer, via conductors extending through the protective layer, the cover layer, and the supporting layer and connected to the pads, and external electrodes including solder bumps, disposed at ends of the via conductors adjacent to the protective layer.
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