A color cathode ray tube (CRT) has a panel having a fluorescent film consisting of a number of groups of phosphors each radiating in a particular color. A shadow mask adjoins the fluorescent film and is formed with a number of apertures by etching. Electron guns are located at the side opposite to the fluorescent film with respect to the shadow mask, and emit electron beams for causing the phosphors to radiate. An insulating glass layer covers the edges of the apertures on the side of the shadow mask that faces the fluorescent film. The glass layer increases the mechanical strength of the shadow mask and enhances landing accuracy.