Electron guns for colour picture tube

In-line electron guns for color picture tube suitable for improving the resolution of the color picture tube is disclosed. In the electron guns, the beam passing openings of first and second accelerating/focusing electrodes are projected or depressed in specified directions, thus to let the focusing actions of the main electrostatic focusing lenses in the vertical direction and in the horizontal direction not only be carried out at different positions but also be differently carried out. Therefore, the electron guns not only reduce the vertical slenderness of the beam spot formed on the center of the screen but also nearly remove the hollow parts of low electron density formed above and below the core part of each beam spot formed on the edge of the screen.