The present invention relates to an ultrasonic generator for a harmful animal repeller that comprises: a cylindrical ultrasonic generator body (18) having a piezoelectric device (16) comprising two electrodes (10, 12) on a lower end portion thereof, and a piezoelectric element (14) arranged between the electrodes; a joining body (34) that has a diameter reduced to be approximately a half of a diameter of the ultrasonic generator body (18), and is joined with a front end portion of the ultrasonic generator body (18); a small-diameter joining body (38) that has a diameter reduced to be approximately a half of a diameter of the joining body (34), and is formed to be integrated with a front end portion of the joining body (34); a joining rod (42) that has a diameter reduced to be approximately a half of a diameter of the small-diameter joining body (38), and is joined with a front end portion of the small diameter joining body (38); and a vibration plate (50) which is joined with the top of the joining rod (42) and is in the shape of a speaker horn.
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