An ultrasonic transducer with a housing having an ultrasonic window in a first region of the housing for transmitting ultrasonic waves, and a transducer element located in the housing adjacent to the ultrasonic window. To prevent ultrasonic waves from being transmitted as housing waves between the first region of the housing, by way of at least one intermediate second region of the housing, to a third region of the housing on opposite side of the second region from the first region, in the second region of the housing, at least two weakly coupled mechanical resonators are provided which are arranged essentially in secession in the propagation direction of the housing waves.