The configuration is made simpler, and deterioration is prevented. At first, a pilot potential with no risk of electrical shock is applied to an energization base (5), the induced current in a seat electrode (7) is measured, whether or not a high voltage can be applied is determined by changes in a current value associated with the seating of a patient (A) to be treated on a chair (4), and when determined that the high voltage can be applied, a therapeutic high voltage is applied to the energization base (5). In addition, whether or not output block is necessary is determined by changes in a current value associated with the separation of the patient (A) to be treated from the chair (4), and when determined that the output block is necessary, the output is blocked.簡化構成,而且防止劣化。首先,對通電台(5)施加沒有觸電危險性的引示電位,計測座電極(7)中的感應電流,藉由隨著被治療者A對椅子(4)的入座的電流值的變化來判定可否施加高電壓,若被判定為可施加高電壓時,對通電台(5)施加治療用高電壓。此外,藉由隨著被治療者A由椅子(4)離開的電流值的變化來判定要否遮斷輸出,若被判定為要遮斷輸出時,即遮斷輸出。1...電位治療裝置3...高電壓發生裝置4...椅子5...通電台7...座電極(檢測用電極)8...下部電極(主電極)9...操作部9a...開始開關11...控制器(入座感測手段、高電壓施加可否判定手段、高電壓施加控制手段、輸出遮斷要否判定手段、輸出遮斷控制手段)12...升壓變壓器13...切換部13a...OFF接點13b...引示電位接點13c...治療用高電位接點14...安全電阻16a、16b...輸入端子16c...電壓輸出端子16d...檢測用端子16e、16f...連接端子A...被治療者Sa...商用電源