An ultrasonic apparatus for cleaning component surfaces (40) by means of a transporting liquid in which ultrasonic waves can be transported, the apparatus including an inlet (6) mounted on a body for filling the transporting liquid into the body, an ultrasonic oscillator (3) in the body for producing ultrasonic waves, a feed in the body for guiding the transporting liquid from the inlet (6) directly to the ultrasonic oscillator (3), so that the ultrasonic waves can be introduced into the transporting liquid and the liquid can be transported, an outlet (7) connected to the feed for discharging the transporting liquid which transports the ultrasonic waves from the body, so that a directed cleaning jet is produced. In addition, a holding device for such an ultrasonic apparatus is provided.