PURPOSE: To inspect whether or not an anode is joined normally by observing the whole anode joining part from above at a time through both flanks of a glass pedestal by the reflection of a microscope arranged above a pressure transducer, and performing visual inspection from above in using the microscope.

CONSTITUTION: The microscope 15 is arranged right above the mount position of the pressure transducer 1 dipped in water 17. The microscope 15 is a stereoscopic microscope through which an observation is made with reflected light and used to inspect visually the anode joining part 27 through both the flanks of the glass pedestal 2 by the reflection of the mirror 14. In the finder visual field of the microscope 15, the anode joining part 27 between the glass pedestal 2 and semiconductor pressure transducing element 7 of the pressure transducer 1 mounted on a base 12 is observed through both the flanks of the glass pedestal 2 which is increased in transparency in the water. Consequently, whether or not there is an air bubble or foreign matter at the anode joining part 27 is inspected visually.