Means for Solving the Problems The concentration measuring device of the present invention comprises a housing having a recess, an electrode accommodated in the recess, a measuring layer including a measuring surface in contact with a liquid to be measured containing the object to be measured, a measurement entered from the measuring surface An osmotic membrane comprising a permeable membrane comprising an emissive layer including an ejection face for ejecting an object into the housing and a dry layer sandwiched between the measurement layer and the ejection layer, the osmotic membrane enclosing the indentation, A measuring part including an inner liquid connecting the electrode and the permeable membrane, a main body connecting part for electrically connecting the electrode to the endoscope reprocessor main body, and a permeable membrane penetrating at least the measuring layer And a cooling unit for cooling the liquid to a solidification temperature or less.本発明の濃度測定装置は、くぼみを有するハウジングと、前記くぼみの中に収容された電極と、測定対象を含有した測定対象液に接触する測定面を含む測定層、前記測定面から侵入した測定対象を前記ハウジング内に放出する放出面を含む放出層、ならびに、前記測定層および前記放出層に挟まれた乾燥層、を含み、前記くぼみを覆う浸透膜と、前記ハウジング内に封入されて、前記電極と前記浸透膜とをつなぐ内部液と、を含む測定部と、前記電極を内視鏡リプロセッサ本体に電気的に接続するための本体接続部と、少なくとも前記測定層に浸透している液体を凝固温度以下まで冷却する冷却部と、を含む。
