The present invention is arranged spaced apart from the parabolic reflector and the reflecting surface having a reflective surface facing the one direction and includes a spark gap switch made to copy the electromagnetic wave, and the spark gap switch of the tubular to be opening is formed on both ends case, the bracket being coupled to the inner opposite ends of the casing, coupled to the bracket is fixed to the electrode fixing portion on the inside of the electrode fixing part and the case that the cable conduit, the electrode body made of so as to generate an electromagnetic wave It included, and the electrode body to reduce the electromagnetic wave generated in the one direction is provided with a cutting plane is cut in the longitudinal direction, and cut above discloses a UWB river electromagnetic wave oscillation device, characterized in that is formed to face the above one direction do.