PURPOSE: To efficiently manufacture a number of anode plates with a silver solder layer in the preset silver soldering area of a laminated body and obtain an accurate silver soldering effect and the reduction of manufacturing cost by watertightly covering the exposed surface other than at least the preset silver soldering area of the laminated body with a corrosion resisting coating material and applying silver plating treatment.

CONSTITUTION: Corrosion resisting plates 20 and 21 are pressed watertightly on each of the outer surfaces of two metal flat plates 12a and 12z located at the outermost end of a laminated body. Then, a silver layer of about 10μm thick is formed on the exposed surface of the laminated body by inserting such a body structure in a plating treatment container and applying high speed plating treatment. When the plates 20 and 21 and a coating member 16 are removed after plating treatment, since a silver soldering material layer 22 is provided at least in the preset silver soldering area of each metal flat plate, it is arranged in an anode cylindrical body as an anode plate. In addition, when a required mean pressure ring and a conductor for inducing an electromagnetic wave are built in at the preset position and the silver soldering material layer 22 is melted in a furnace, an anode body structure is obtained without using a ring-type silver soldering material.