PURPOSE: To facilitate the working of a recording electrode unit and to reduce the cost of manufacture by separating the electrode part of the recording electrode unit and by attaining an electrostatic latent image function by using flanks of all separated eledctrodes.

CONSTITUTION: An external peripheral electrode 3 arranged successively in a screw shape around a sylindrical recording electrode unit 1 is separated into a left and a right part by making a separation groove 21, and the separated edges are used as recording electrode discharging edges 22 to discharge an electrostatic latent image to a lower electrode 2. Consequently, the recording electrode unit is worked easily by lathe working, so the cost of a multistylus electrode, etc., is reduced. Further, any guide electrode is not necessary, which contributes to the reduction of the cost.