PROBLEM TO BE SOLVED: To provide a charging device which suitably judges whether or not deposit on a discharging electrode needs to be removed, and furthermore allows for shortening of a time for the judgment.SOLUTION: The charging device comprises: a discharge electrode； a counter electrode arranged opposite the discharge electrode； a voltage application part that applies voltage to the discharge electrode； a measurement part, including at least one of a discharging voltage measurement part that measures a discharge voltage value between the discharge electrode and the counter electrode, a discharging current measurement part that measures a discharge current value between the discharge electrode and the counter electrode, and a discharging resistance measurement part that measures a discharge resistance value between the discharge electrode and the counter electrode； a storage part that stores a change with time of the measured value measured by the measurement part； and a judgment part that judges the presence or the absence of a change point where the measured value stored in the storage part changes from a monotonous increase to a monotonous decrease, or from a monotonous decrease to a monotonous increase and judges an amount of deposits on the discharge electrode is large when judging that the change point is present.SELECTED DRAWING: Figure 3COPYRIGHT: (C)2020,JPO&INPIT【課題】放電電極に付着した付着物を除去する必要があるか否かの判定を適切に行いつつ、判定にかかる時間を短くすることができる荷電装置を提供する。【解決手段】荷電装置は、放電電極と、放電電極に対向して配置される対向電極と、放電電極に電圧を印加する電圧印加部と、放電電極と対向電極間の放電電圧値を計測する放電電圧計測部、および、放電電極と対向電極間の放電電流値を計測する放電電流計測部、および、放電電極と対向電極間の放電抵抗値を計測する放電抵抗計測部のうちの少なくとも一つを含む計測部と、計測部で計測された計測値の時間による変化を記憶する記憶部と、記憶部に記憶された計測値が、単調増加から単調減少へ変化、または、単調減少から単調増加へ変化する、変化点の有無を判定するとともに、変化点を有すると判定された場合に、放電電極に付着した付着物の量が多いと判定する判定部と、を備える。【選択図】図３
