A color cathode ray tube having a striped phosphor screen is provided, in which color displacements due to the tube axis (Z-axis) component of the terrestrial magnetism can be decreased at low cost. A positive temperature coefficient thermistor 13 and a degaussing coil 11 are connected in series to an AC power source (AC 100V) 12 via a switch SW. A rectifier/smoothing circuit 14 is provided in parallel to the positive temperature coefficient thermistor 13. When the switch SW is turned on, an ordinary degaussing process due to the AC attenuating magnetic field interlinked to the degaussing coil 11 is performed, and the DC magnetic field in the Y-axis direction interlinked to the degaussing coil 11 decreases the influence of the terrestrial magnetism in the tube axis direction (Z-axis direction). <IMAGE>
