Abstract: An electrotherapeutic device includes a small-sized flat primary cell provided on top and bottom thereof with electrodes insulated from each other by an electrical insulating layer. A covering sheet is provided to enclose the first and second electrodes and the primary cell to define a gap therebetween. A medicine having conductivity and fluidity is introduced into the gap through its bottom opening. A peelable sheet is stuck on the peripheral portion of the covering sheet to seal a medicine in the gap.