Problem to be solved: to ensure that the measurement probe and the main body of the pressure measuring apparatus are surely connected in a normal state, and to ensure the airtightness and the withstand voltage at the time of connection, and to obtain accurate measurement results.A sealing material 40 is disposed between the differential cylinder portion 20 and the probe side connection tube portion 11. A first projecting portion 11C is formed on the inner peripheral surface of the probe side connection tube portion 11. A second projecting portion 20b is formed on the outer peripheral surface of the insertion tube portion 20. The first projecting portion 11C is engaged with the second projecting portion 20b.Diagram【課題】測定用プローブと圧力測定装置本体とを正規の状態で確実に接続できるようにするとともに、接続時の気密性及び耐圧性を確保して正確な測定結果が得られるようにする。【解決手段】差込筒部２０とプローブ側接続管部１１との間にシール材４０を配設する。プローブ側接続管部１１の内周面に第１突出部１１ｃを形成する。差込筒部２０の外周面に第２突出部２０ｂを形成する。第１突出部１１ｃと第２突出部２０ｂとを係合させる。【選択図】図４
