A focus electrode 4 is constituted by first type of focus electrode groups 43, 45 to which a first focus voltage is applied, and second type of focus electrode groups 44, 46 to which a second focus voltage is applied. Between the first type of focus electrode groups and the second type of focus electrode groups are formed a lens for correcting the field curvature and an electrostatic quadruple lens. The center axes of the outer electron beam passage holes in the first type of focus electrode forming the lens for correcting the field curvature are deviated on a horizontal plane from the center axes of the outer electron beam passage holes in the second type of focus electrode. The electrostatic quadruple lens produces dissimilar intensities for the outer electron beams and for the center electron beam. Therefore, the outer electron beam passage holes work to deflect the outer electron beams toward the center electron beam with an increase in the deflecting amount of the electron beams, and a favorable resolution is obtained on the whole screen of the cathode-ray tube.