Abstract: Disclosed is a radiation suppression device for suppressing undesired radiation which is caused by a leak magnetic field produced by a deflecting coil that is wound around a deflection yoke of a cathode ray tube display unit. An auxiliary coil is provided which is connected electrically to the deflecting coil on the outer wall face of the deflection yoke at a position corresponding to the position at which the deflecting coil is wound and both the number of turns and the winding direction of the auxiliary coil are so selected that the leak magnetic field produced by the deflecting coil is cancelled by the magnetic field produced by the auxiliary coil which is connected in series or in parallel with the deflecting coil.In order to allow the auxiliary coil to be mounted with ease, a plurality of hanger means are formed on the front and rear portions of the separator which forms the deflection yoke, and wires are hung over these hanger means when forming the auxiliary coil.