SURFACE ACOUSTIC WAVE DEVICE

PROBLEM TO BE SOLVED: To provide a compact surface acoustic wave device.SOLUTION: A surface acoustic wave device 1 includes a piezoelectric substrate 10, a surface acoustic wave element 30 formed on the piezoelectric substrate 10 and a bump pad 11 formed on the piezoelectric substrate 10. The surface acoustic wave element 30 includes interdigital electrodes 32, 33, and 34 formed on the piezoelectric substrate 10 and a pair of reflectors 31 and 35 formed on both sides in a traveling direction of a surface acoustic wave of the interdigital electrodes 32, 33, and 34 and formed on the piezoelectric substrate 10. At least one reflector 31 of the pair of the reflectors 31 and 35 is weighted so that a cross width of a side which is not opposed to the interdigital electrodes becomes smaller than a cross width of a side which is opposed to the interdigital electrodes. The bump pad 11 is formed adjacent to an area where the reflector is formed if the reflector is not weighted.