(57) Abstract Topic As for this invention improving assembly quality, because it is possible, to compensate the aberration component of astigmatism and the like, it offers the inline model electron gun of the color cathode ray tube which can improve the focusing quality of the whole picture greatly. Solutions The main lens of the electron gun focusing electrode is formed with 6 and accelerating electrode, 7 the electric field compensator 9,10 where three electron beam passing holes are arranged into the inline is arranged vertically inside the aforementioned respective electrode section 6,7 vis-a-vis the electron beam passing axis, the plural circular arcs where among the aforementioned electric field compensators at least one form of the central electron beam passing hole is formed with keyhole form to vertical line pair name vis-a-vis the electron beam passing axis, as for both side electron beam passing hole vis-a-vis the vertical line of the electron beam non passing axis symmetrically, at least possesses the radius of 2 kinds or more and thatThe circular arc and others being connected, it features that it was formed.
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