Cathode ray tube

A color cathode ray tube including a vacuum envelope comprised of a panel portion having an approximately rectangular shape and which has a phosphor film of three colors on an inner surface thereof, a neck portion which accommodates an inline type electron gun, and a funnel portion which connects said panel portion and said neck portion and has a deflection yoke mounting region at a transition region between said funnel portion and said neck portion;

• wherein the shape of an outer wall opening and the shape of an inner wall opening in a direction perpendicular to the tube axis within a range which extends 35 mm to the panel portion side and 20 mm to the neck portion side from a reference line set in said deflection yoke mounting region of the funnel portion are respectively formed in an approximately rectangular shape and an approximately pin-cushion shape, the shape of the inner wall opening of said funnel portion in a direction perpendicular to the tube axis of the deflection yoke mounting region has a curvature which is indented toward the tube axis at respective corners, and the distance between a first straight line which connects neighboring bottom portions of said corner portions and a second straight line which is in contact with a central point of the inner wall between said neighboring corner portions and is disposed parallel to said first straight line is set to 2.0 mm at maximum, provided that the direction toward the tube axis is taken as +.