| 摘要 |
A ring-like groove 140 for accommodating a seal ring 130 is formed in fitting surfaces 12 c and 13 c of pressure introduction portions 12 b and 13 b for introducing a pressure from a measured member 200 to a sensing portion. The pressure introduction portions 12 b and 13 b are fitted to the measured member 200 through the seal ring 130 . Projection portions 141 are formed on the side surface of the groove 140 and a part of the seal ring 130 is pressed at these projection portions 141 into the groove 140 . The seal ring 130 is thus retained inside the groove 140.
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