PROBLEM TO BE SOLVED: To provide an endoscope reprocessor capable of prolonging a replacement cycle of a densitometer by correcting an influence by a disturbance substance.SOLUTION: An endoscope reprocessor 1 includes a treatment tank 23, a tank 31a, a first densitometer N, a second densitometer M, a protection part 81 for protecting the second densitometer M so as to prevent a chemical solution in contact with an endoscope from coming into contact with it, a first contact part for causing the chemical solution in contact with the endoscope to come into contact with the first densitometer N, a second contact part 82 for causing calibration liquid for calibration to come into contact with the first densitometer N and the second densitometer M, and a calibration processing part P for creating a calibration curve of the first densitometer from a current value measuring result by the first densitometer when in contact with the calibration liquid, and a density measuring result by the second densitometer when in contact with the calibration liquid, and calibrating the first densitometer N.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2019,JPO&INPIT【課題】 外乱物質による影響を補正することによって濃度計の交換サイクルを長期化することができる内視鏡リプロセッサを提供する。【解決手段】 内視鏡リプロセッサ1は、処理槽23と、タンク31aと、第1濃度計Nと、第2濃度計Mと、内視鏡に接触した薬液が接触しないよう第2濃度計Mを保護する保護部81と、内視鏡に接触した薬液を第1濃度計Nに接触させる第1接触部と、校正用の校正液を第1濃度計N及び第2濃度計Mに接触させる第2接触部82と、校正液に接触した際の第1濃度計の電流値測定結果、及び、校正液に接触した際の第2濃度計の濃度測定結果から第1濃度計の検量線を作成して第1濃度計Nを校正する校正処理部Pと、を含む。【選択図】図1