Abstract: An ultrasonic flowmeter with a measuring tube through which flows a medium and which, viewed in its cross section, has a split circumference forming two halves and with two ultrasonic converter pairs, each with an associated ultrasound reflector. The converters of each converter pair are mounted on a common circumferential half in a mutually offset position as viewed in the longitudinal direction of the tube, while the reflector for each converter pair is positioned on the other, opposite circumferential half in the longitudinal direction of the measuring tube between the two converters, so that an ultrasound signal emitted by one converter of a converter pair travels along a V-shaped signal path via the reflector of the associated converter pair to the other converter of that converter pair.