Patent ID: 7034434

Claim:
A surface acoustic wave device comprising: a surface acoustic wave element having, on a functional surface thereof, a vibrating portion including at least one comb-shaped electrode portion disposed on a piezoelectric substrate; a mounting board; and a sealing resin; wherein the surface acoustic wave element and the mounting board are connected through bumps so that a mounting surface of the mounting board and the functional surface of the surface acoustic wave element face each other, an outer peripheral edge of the surface acoustic wave element is sealed by the sealing resin, and a vibration space is secured between the vibrating portion of the surface acoustic wave element and the mounting surface of the mounting board; and an outer barrier disposed so as to enclose the bumps and the vibrating portion is provided on the functional surface of the surface acoustic wave element so as to be disposed only between the functional surface of the surface acoustic wave element and the mounting board, and the outer barrier includes a level difference defined by a lower surface of the outer barrier having portions that are disposed at different distances from the mounting board.