Ultrasonic flow meter unit, and manufacturing method of ultrasonic flow meter unit

An ultrasonic flow meter unit mounted to a fluid passage through which a measurement target fluid flows, the ultrasonic flow meter unit comprising:

• a pair of ultrasonic transducers each including a piezoelectric substrate which generates an ultrasonic pulse, and an acoustic matching member, the pair of ultrasonic transducers being placed on the fluid passage such that the ultrasonic transducers mutually transmit and receive the ultrasonic pulse;
• a measuring circuit which is placed to contact the fluid passage, and measures a flow of the measurement target fluid based on time for which the ultrasonic pulse propagates between the pair of ultrasonic transducers;
• and
• an insulating damping member unitarily formed to cover at least a portion of each of a portion of each of the pair of ultrasonic transducers, which portion contacts the fluid passage, the piezoelectric substrate, and the measuring circuit.