The pneumoperitoneum device is connected to an air supply gas source and is connected to an endoscope having a pneumoperitoneous air supply conduit for feeding pneumoperitoneumed gas, an pneumoperitoneum air supply conduit and a flexible insertion part An endoscope connection tube for connecting the endoscope transmission air duct provided therein, an air supply flow rate measurement section for measuring an air supply flow rate as a measurement flow rate, and a setting flow rate for targeting the measured air supply flow rate An air supply flow rate adjustment unit for changing the adjustment value to adjust the air supply flow rate to the endoscope delivery air duct when the measured flow rate is not equal to the set flow rate An adjustment value storage unit that stores an adjustment value of the air supply flow rate adjustment unit when the measured flow rate is equal to the flow rate and an adjustment value storage unit that stores the adjustment value read from the adjustment value storage unit when the measured flow rate has changed below the threshold value after reaching the set flow rate And a control unit that performs control to set the air flow rate to the air supply flow rate adjustment unit.気腹装置は、送気ガス源と接続され、気腹用の送気ガスを送気する気腹用送気管路と、気腹用送気管路と軟性の挿入部を有する内視鏡内に設けられた内視鏡送気管路とを接続する内視鏡接続チューブと、送気流量を測定流量として測定する送気流量測定部と、測定される送気流量を目標とする設定流量を設定する設定流量設定部と、測定流量が設定流量に等しくない場合には、調整値を変更して内視鏡送気管路への送気流量を調整する送気流量調整部と、測定流量が設定流量と等しいときに、送気流量調整部の調整値を記憶する調整値記憶部と、測定流量が設定流量に達した後において閾値以下に変化したときには、調整値記憶部より読み出した調整値を送気流量調整部に設定する制御を行う制御部と、を有する。
