Inline electron gun and color cathode ray tube

An inline electron gun and a color cathode ray tube provided with the inline electron gun for reducing the manufacturing cost for an assembly jig of the electron gun, for example, that might be generated with a change in the size of the cathode ray tube and for realizing a favorable static convergence property is provided. The inline gun includes a first flat plate electrode, a second flat plate electrode, two cylindrical electrodes at least is used. An opening geometry of outer passage holes provided in the first flat plate electrode and the second flat plate electrode is configured by combining an inner curve and an outer curve, which have different degrees. The opening geometries of the outer passage holes are symmetric with respect to a line. At least one of the outer curves and the inner curves in the outer passage holes have different degrees.