Abstract: An arc suppressing device for a cathode ray tube having an evacuated glass envelope which includes a funnel with a neck and a panel provided with a shadow mask. An electron gun is housed in the neck and includes a cathode and a plurality of electrodes supported by supporting beads. On the outer surface of the focusing electrode, at least one or more projecting metallic pieces pass through the supporting beads so that the ends thereof are exposed to the outside of the supporting bead. Between the ends of the projecting pieces and the inner surface of the neck, an electric field is formed to effectively prevent the occurrence of arcing in the bead channels.