The present invention provides a color cathode ray tube having a shadow mask
for selecting colors, wherein the shadow mask satisfies the relation:
##EQU1##
where Rh is a mean curvature radius in the direction of the long axis of the
shadow mask, H is a distance between both ends in a direction of a long axis of
an effective surface of the shadow mask, and a mean curvature radius in the direction
of the long axis satisfies the condition:
##EQU2##
where Zh is a recess amount in a direction of a tube axis at an end of the
long axis of the effective surface with respect to a center of the effective surface.
