PURPOSE: To prevent product damage and keep safety by protecting a capillary tube, and constituting a liquid-contact part to be adapted the process connection.

CONSTITUTION: For sealant, silicone oil or fluorine-based oil with large compressibility and thermal expansion value is used. To reduce the sealant amount, an insulation material 5 is packed in the space filled with the sealant, a very thin pipe is used for capillary tube 8, and its protection structure is made to have liquid contact part 7 proper for reducing the size of the system. For this purpose, round chamfer fabrication is applied to the take-out part of the capillary tube 8 of the liquid contact part 7, a connector 10 provided with the round chamfer at the take-out part of the capillary tube 8 of the main body 1 is placed and the capillary tube 8 is protected from damage due to bending in treating and the like. By constituting like this, clearance between parts is avoided, assembly work performance is improved and the reliability in treating the pressure transducer is assured.