In a color cathode ray tube, a vaccum envelope (1) is provided with a plurality of necks (5-1, ...5-12) and a plurality of funnels (4-1,...4-12) for coupling the respective neck (5-1; ...5-12) to a single panel (3). A plurality of electron gun assemblies (6-1;...6-12) are received in the neck (5-1; ...5-12), respectively and a plurality of deflection yokes (7-1;...7-12) are mounted around the funnels (4-1; ...4-12), respectively. A screen (2) is formed on the inner surface of the faceplate (3-1) of the panel (3) and is defined by a plurality of continuous segment regions (16-1; ...16-12) each of which is scanned with electron beams from the corresponding electron gun assembly (6-1; ...6-12) and deflected by corresponding deflection yoke (7-1; ...7-12). A shadow mask (8) is received in the panel (3) and is faced to the screen (2). The shadow mask (8) has a plurality of effective row and clumn regions (18-1; ...18-12) corresponding to the segment regions (16-1; ...16-12) and a noneffective region (7A, 7B) for surrounding and partitioning the respective segment regions (16-1;...16-12).