Abstract: A disposal or waste apparatus for used or waste injection syringes including a housing with a power transformer, a fan, a deodorant cartridge and a scrap containing box, and a cartridge type electrode plate unit detachably provided to the housing. Cartridge type electrode plate unit has two insertion holes for injection syringes, and two pairs of electrodes separated from each other and cross each other in order to electrically contact with contact terminals of the electrode plates in the housing. The used syringes inserted through the insertion holes respectively come into contact with one pair of electrodes and melt by short circuit current flown between the electrodes and turn on the fan so that any odor gas generated is blown through the deodorant cartridge. The apparatus further includes a switch rod actuated by sliding of said scrap containing box to open a primary winding of said power transformer.