An electrostatic treating apparatus comprises a tank 1 containing an insulating solvent A in which a pair of electrodes 4 is arranged and a liquid 2 is introduced from an inlet 3 and electrostatically treated. A guide plate for guiding treated water to the upper side of a pocket 7 is provided at the lower part of the aqueous layer B formed above the upper edge of the inner wall 5 of the pocket 7 and plural baffle plates 18 having openings at the upper part and the lower part alternately are equipped vertically at given intervals between the guide plate 8 and the lid of the tank 1, and an adsorbing agent vessel 19 can be equipped between the baffle plates 18. The treated water which goes up from an opening 9 between the outer side wall 6 of the pocket 7 and the guide plate 8 is passed through the adsorbing agent vessel 19 to be introduced to a discharge outlet 12. Further the electrodes 4 and the main parts of the guide plate 8 are hung and fixed to the lid D of the tank 1 so that they can be equipped to the tank 1 together with the lid D.