To provide an ultrasonic flowmeter having high reliability and capable of improving accuracy in measurement.

In this ultrasonic flowmeter 10, as a sensor storing thin part 26 is raised from an end part wall 14, the sensor storing thin part 26 is separated from the end part wall 14, and a thickness dimension of the sensor storing thin part 26 can be easily controlled. Thus the accuracy in thickness dimension of a thin bottom wall 25 with which a vibrational face 36 of an ultrasonic sensor 30 is closely kept into contact, can be improved. As the thin bottom wall 25 is thinned in comparison with the whole end part wall 14, a distance from the vibration face 36 of the ultrasonic sensor 30 to the liquid can be shortened in comparison with a conventional one where the ultrasonic sensor is mounted on an outer face of a pipe of approximately uniform thickness through a bracket, the attenuation of ultrasonic wave can be reduced, and the measuring accuracy can be improved.

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