To provide an ultrasonic instrumentation for a processing device using an ultrasonic wave which can observe raw data concerning the occurrence status of ultrasonic cavitation.

The ultrasonic instrumentation 10 for a processing device using ultrasonic sets a vibrator 31 assembled with a piezoelectric element in liquid, generates the ultrasonic wave 30 in the liquid by emitting high frequency with a specific frequency in the piezoelectric element, and processes the member to be processed by washing and the like with the generated ultrasonic wave 30. The ultrasonic instrumentation 10 is constituted by attaching a pipe 15 to a pressure gauge 11 for dipping the tip end of the pipe 15 in liquid, introducing the liquid into the pipe 15, and measuring the ultrasonic wave 30 transmitted in the liquid in the pipe 15 with the pressure gauge 11.