Abstract: A ferrite core for a deflection yoke of a CRT includes concave and convex portions for correcting a raster distortion of the deflection yoke by varying a magnetic path at one end of a screen portion of the ferrite core. The ferrite core may be incorporated in a deflection yoke that includes a horizontal deflection coil for deflecting electron beams emitted from an electron gun in the horizontal direction, a vertical deflection coil for deflecting the electron beams in the vertical direction, and a holder for fixing the horizontal deflection coil and the vertical deflection coil to given positions and separating them from each other. The ferrite core also prevents a magnetic force caused by the horizontal and vertical deflection coils from being reduced.