| 摘要 |
PROBLEM TO BE SOLVED: To provide an acoustic wave device in which adhesive material is prevented from flowing into the casing or the acoustic wave propagating section of an acoustic wave element, vibration is prevented from being suppressed by resin adhering to the acoustic wave propagating section, and the electrical characteristics are prevented from fluctuating. SOLUTION: A piezoelectric substrate 1, provided with an exciting electrode 5 generating an acoustic wave, is contained in a casing 2 having an opening, and the open upper surface of the casing 2 is sealed hermetically by a cover 3 via an adhesive material 4. An annular recess 12 is formed in the open upper surface of the casing 2 and an outer protrusion 9, having an outer upper surface located on the outside of the recess 12, is formed lower than an inner protrusion 10 having an inner upper surface located on the inside of the recess 12. The adhesive material 4 is interposed between the outer upper surface and the cover 3.
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