PURPOSE: To enable absorption of vibration and to prevent the occurrence of disconnection and defective contact by providing a resilient part to form a curved part when a first and a second conduction parts are electrically connected, on a part of a circuit part connected to either of the two conduction parts of a piezoelectric vibrator.

CONSTITUTION: An ultrasonic vibrator used as a cleaning device for a mirror for an automobile has a flexible base sheet 7 formed by a flexible insulating film. The base sheet 7 has electrode forming tools 71 and 72 formed such that two conduction parts 61 and 62 are formed on electrodes 21 and 22 disposed on the two ends of a piezoelectric element 23 by which an ultrasonic vibrator 2 is formed in association with the two electrodes. In this case, electrode forming parts 71 and 72 are integrally continuously formed, and when the two conduction parts 61 and 62 are joined to the end surface of the piezoelectric vibrator 2, the two conduction parts are connectable through a resilient part 74 in a curved state. The resilient part 74 is curved approximately in a U-shape so that the two conduction parts 61 and 62 are positioned facing each other for integral formation to form a piezoelectric vibrator 2.