The second dynamic quadrupole lens portion is formed in the prefocus lens portion of the electron gun for color cathode ray tube.;The second dynamic quadrupole lens unit is composed of two divided electrodes, the electron beam passing holes of each electrode are formed to be rotationally asymmetric with each other, and the first dynamic 4 formed on the focusing electrode by applying a dynamic voltage to at least one electrode of each electrode. The function of the plural lens unit can be prevented from deteriorating the focus characteristic in the horizontal direction due to the vertical spot reduction and the horizontal spot enlargement in the main surface portion of the screen and preventing the moire 'phenomenon in the vertical direction in the low current region.
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