A potential therapeutic apparatus capable of automatically adjusting the height of a head electrode according to the height of the head of a subject to be treated to constantly provide the best therapeutic effect. The potential therapeutic apparatus (1) comprises a head electrode (5) attached to a foldable chair (7) so as to be able to rise/fall and incline backward, an elevating device (12) for elevating/lowering the head electrode (5), and an optical sensor (18) for detecting the height position of the subject to be treated P, wherein the drive unit (12A) of the elevating device (12) is controlled for its operation based on a detection signal by the optical sensor (18). A high voltage-use cable (15) and a low voltage-use cable (16) are disposed away from each other so as to hold the elevating device (12) for the head electrode (5). A transparent insulating member (27) provided between the optical sensor (18) and the head of the subject to be treated P is formed into a step-difference sectional shape and is quite long at portion thereof overlapping an support arm (9).本發明係提供一種電位治療裝置，係自動地進行因應被治療者的頭部的高度之頭部電極的高度調整，可經常獲得最佳的治療效果。；該電位治療裝置1係具備有：可升降地且可向後方傾斜地安裝於可折疊的椅子7之頭部電極5，使該頭部電極5升降的升降裝置12，及檢測出被治療者P的頭部的高度位置之光感測器18；升降裝置12的驅動部12A係依據光感測器18的檢測信號，進行動作控制。高電壓用纜線15和低電壓用纜線16，係以挾住頭部電極5的升降裝置12之方式互相分離而配置。設置於光感測器18和被治療者P的頭部之間的透明絕緣構件27，係形成剖面段差形狀，且以沿面距離成為特定值以上的方式，加長形成和支持臂9的重合部分的長度。
