PROBLEM TO BE SOLVED: To provide a connection structure for a pressure measurement probe, which is enabled to measure a pressure precisely, when the internal pressure of a measurement system is prevented from rising higher than an atmospheric pressure by the connection of a probe, in the case where a pressure is inexpensively measured with respect to the atmospheric pressure without providing a pressure adjustment mechanism for adjusting the pressure inside of the measurement system.SOLUTION: A cylindrical member 20 of a probe 1 comprises a connection part 21 connected to a connector, and a communication hole 24. The probe 1 is equipped with a switching member 40 for switching an atmosphere open state in which the communication hole 24 is opened into the atmosphere, and a non-open state in which the communication hole 24 is in an unopened state.SELECTED DRAWING: Figure 15COPYRIGHT: (C)2017,JPO&INPIT【課題】測定系の内部の圧力を調整する圧力調整機構を設けずに大気圧を基準として安価に圧力を測定する場合に、測定系の内部の圧力がプローブの接続によって大気圧よりも上昇してしまうのを抑制し、圧力を正確に測定できるようにする。【解決手段】プローブ1の筒部材20には、コネクタに接続される接続部21と、連通孔24とが設けられている。プローブ1には、連通孔24を大気に開放する大気開放状態と、連通孔24を非開放状態とに切り替えるための切替部材40が設けられている。【選択図】図15
