An ultrasonic transducer and a skin care device are provided. The ultrasonic transducer comprises an ultrasonic vibrator (4) and a horn (5). The ultrasonic vibrator is stuck on a join surface (9) of the horn with adhesive. The horn further comprises a stopper for restricting adhesive flash caused by adhesive intervened between the join surface and the ultrasonic vibrator.The stopper comprises a concave groove (12) formed around the join surface along the outline of the ultrasonic vibrator. Alternatively, the stopper is formed is formed of a projection wall (15) formed around the join surface along the outline of the ultrasonic vibrator.
