surface acoustic wave filter includes saw resonators , a discharge induction pattern is provided between a ground and at least one of a signal input terminal and a signal output terminal , and the discharge induction pattern has multiple gaps that are narrower than gaps that exist inside electrode patterns of the saw resonators . since the discharge induction pattern has multiple gaps that are narrower than gaps that exist inside electrode patterns of the saw resonators , it is possible to induce the electrostatic discharge without fault . the multiple gaps are provided so as to protect the saw resonators against multiple times of electrostatic discharge .