Abstract: An injection syringe slot 28 for holding a tip of a syringe 30 detachably is formed on a case 2. A pair of shafts 4 and 6 connected to a rotary drive device is journalled on the case 2, and a plurality of elongate electrodes 8 and 10 are fixed to each of the shafts 4 and 6 at a predetermined interval. Each electrode 8 of the shaft 4 of one side forms a pair with each electrode 10 of the shaft 6 of the other side which is opposed to each other with a difference in level in axial direction, and a plurality of sets of a pair of electrodes are set so that the opposite interval of a pair of electrodes of a lower level is narrower than the opposite interval of a pair of electrodes in upper level. When the syringe 30 is inserted and set at the syringe slot 28 of the case, the syringe 30 is supported at the syringe slot. When the shafts 4 and 6 are driven, the electrode 8 of plus side and the electrode 10 of minus side approach to each side of an injection needle 42.