line electron beams and disposed on a phosphor screen side of the electron gun; the plurality of magnetic pieces including a first pair of magnetic pieces positioned on a neck wall side of each of side electron beams of the three in-line electron beams in the in-line direction and a second pair of magnetic pieces positioned on opposite sides of a center electron beam of the three in-line electron beams in the in-line direction; and the first pair of magnetic pieces each having a first pair of protruding portions extending toward an adjacent one of the second pair of magnetic pieces, the first pair of protruding portions of the first pair of magnetic pieces being arranged on opposite sides of a corresponding one of the side electron beams of the three in-line electron beams in a direction perpendicular to the in-line direction; the second pair of magnetic pieces each having two second pairs of protruding portions, one of the second pairs of protruding portions extending toward an adjacent one of the first pair of magnetic pieces and the other of the second pairs of protruding portions extending toward an adjacent one of the second pair of magnetic pieces each of the second pairs of protruding portions of the second pair of magnetic pieces being arranged on opposite sides of a corresponding one of the three in-line electron beams in a direction perpendicular to the in-line direction; the first pair of magnetic pieces having a portion of an axial length greater than a