An ultrasonic flow rate measuring device for measuring the flow rate of a medium flowing through a line (1), with at least one ultrasonic transducer (2) and a guide frame (3) for guiding and holding the ultrasonic transducer (2). An electrical connecting box (12) which has a connection (13) for a cable (14) to the ultrasonic transducer (2) and a connection (15) for a cable (16) to the measuring device electronics is provided. Thus, in a clamp-on ultrasonic flow rate measuring device, simple cabling is achieved.