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1. A flowmeter sensor comprising an ultrasonic transducer that generates ultrasonic waves, a pipe through which a fluid flows, and an acoustic prism having a bottom surface that is arranged in contact with the outer peripheral surface of the pipe and a front-side inclination face that supports the ultrasonic transducer, and propagates ultrasonic waves from the ultrasonic transducer toward the fluid in the pipe, wherein the pipe is made of a first heat-resistant resin having heat resistance in a temperature range of 90° C. to 200° C. and negative thermoacoustic characteristics in which the ultrasonic transmittance decreases as the temperature rises in such a temperature range, and the acoustic prism is made of a second heat-resistant resin having heat resistance in a temperature range of 90° C. to 200° C. and positive thermoacoustic characteristics in which the ultrasonic transmittance increases as the temperature rises in such a temperature range.
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