To provide a propelling device which is operated only by electricity and magnetic force without requiring propellent, atmosphere, and seawater.

Two electrodes for electric discharge are arranged on a surface of the propelling device which is resistant to heat and hardly conducts electricity. A function of generating a magnetic field between the electrodes is provided to the propelling device. Electric discharge is made by applying a positive voltage and a negative voltage to the electrodes, and a current is flown between the electrodes in which the magnetic field is generated. Interaction is generated on the current and the magnetic field, and the discharged current is moved. Simultaneously, reaction is generated on the device which generates the magnetic field. This force is temporary one, but this force can be continuously obtained by intermittently repeating these behaviors.