PURPOSE: To achieve a higher treating effect and a higher workability in assembling and disassembling by connecting a conducting sheet and an insulating sheet to a body case through a cylinder part while an electrode body is inserted with an insertion of a cylinder body into a mounting hole.

CONSTITUTION: A cylinder body 12 is formed protruding upward from an insulating sheet 11 made of a soft rubber material and a soft conducting sheet 14 is applied entirely over an undersurface of an insulating sheet 11 and an internal surface of the cylinder body 12. The insulating sheet 11 has the cylinder body 12 inserted into a mounting hole 10 as being somewhat pressed and upon the completion of the insertion, a flange 13 is retained at an upper rim part of the mounting hole 10 to lock and held on an undersurface of a body case 2. Under such a condition, an electrode rod 15 is inserted into the cylinder body 12 as being somewhat pressed. With such an arrangement, as the conducting sheet and the insulating sheet are connected together through the body case and the cylinder body part, they deflects so well to fit even a curved part of a human body thereby achieving a higher treating effect. The mounting is completed simply by inserting the cylinder body into the mounting hole 10, and further, the electrode body. This achieves a higher workability in assembling and diassembling.