Patent ID: 7474175

Claim:
A surface acoustic wave device comprising: a surface acoustic wave element having a first surface on which an electrode is formed; a mounting substrate having an electrode on a surface and disposed facing the first surface with a gap of a predetermined distance sandwiched therebetween; a bump for coupling the electrode on the surface acoustic wave element and the electrode on the mounting substrate to each other; and a sealing resin formed on the mounting substrate so as to cover the surface acoustic wave element; wherein the sealing resin comprises a first resin surrounding the surface acoustic wave element and covering the mounting substrate on a periphery of the surface acoustic wave element, a second resin covering at least the first resin, and a third resin covering at least the second resin, in which the third resin has an elastic modulus that is lower than an elastic modulus of the second resin and that is higher than an elastic modulus of the first resin, wherein a thickness of the first resin formed on a side surface of the surface acoustic wave element is 1/10 to 1/2 of the distance of the gap.