Patent ID: 7389570

Claim:
A surface acoustic wave device manufacturing method comprising: an electrode layer forming step for forming an electrode layer on a main surface of a piezoelectric substrate; an electrode patterning step for forming filter regions each having IDT electrodes, an input electrode part, and an output electrode part by patterning the electrode layer on the main surface; a separating step for separating the piezoelectric substrate to obtain a number of surface acoustic wave elements; a mounting step for mounting the surface acoustic wave elements on a mounting substrate so that the main surface of the piezoelectric substrate faces the mounting substrate; a conductor layer forming step for forming a conductor layer on a generally entirety of the other surface of the piezoelectric substrate (i) before the electrode layer forming step, (ii) between the electrode layer forming step and the electrode patterning step, or (iii) between the electrode patterning step and the separating step; and a conductor layer removing step for removing the conductor layer formed on the other surface before the separating step.