A high-resolution fluorescent luminous tube is provided wherein no light leaks from the gap between electrodes and fluorescent substance layers are formed with high precision. The fluorescent luminous tube includes anode conductors 3 and bars of a grid 8, arranged over an inner surface of a translucent insulating substrate 1 and spaced apart from one another, the anode conductors each having an opening which exposes the substrate, and a fluorescent substance layer 5 formed in the opening. Light emission of the fluorescent substance layer caused by impingement of electrons emitted from a cathode is observed from the outside of the substrate via the opening. The lightproof insulating layer 12 is formed in the gap between each anode conductor and each bar of the grid. The lightproof insulating layer 12 can block light emission leaking to the front surface through the gap between an anode conductor and a bar of the grid formed on the substrate, thus improving the display contrast. The fluorescent substance layer can be formed inside the opening in an anode conductor by coating a photosensitive fluorescent substance paste all over the surface of a substrate and then exposing it to light through the outer surface of the substrate. This approach can provide a more-simplified process with higher precision, compared with the conventional method where a fluorescent substance paste is coated only in the opening by means of a mask.