The problem to be solved by the invention is to shorten a period of time for measuring the air leakage of an exhaust valve for a hemadynamometer and to improve the measurement precision therefor. In the solution, at the side of the one end of an air tube 8, an exhaust valve 2 is for the hemadynamometer mounted to the other end. An electromagnetic valve 5 for supplying air is provided. Between the electromagnetic valve 5 and the exhaust valve 2, an air tank 7 with a pressure sensor 9 is provided, and tube internal pressure P being a sensor detected value is displayed on a monitor 11 through an A/D converter 10 etc. In the vicinity of the other end of the air tube 8, an electromagnetic valve 15 for holding tube internal pressure is provided. Each time of finishing measurement, the electromagnetic valve 15 is closed, and the next measurement is carried out while the tube internal pressure P is sealed and held as it is.本發明之課題係於血壓計用排氣閥之漏氣測定裝置中可實現縮短時間與提高測定的精密度。；本發明之解決手段係於空氣套管其中一端安裝有血壓計用排氣閥2，另一端則設置有供給空氣用電磁閥5。於該電磁閥5和排氣閥2之間設置附有壓力感應器9的空氣槽7，而且感應器檢出值的套管內壓P係透過A/D(類比轉數位)轉換器10等來顯示在顯示器11上。而於空氣套管8的其中一端周圍設置有保持套管內壓用電磁閥15，且於結束每次測定時將會關閉電磁閥15而於密閉保持套管內壓P的狀態下來進行每一次的測定者。
