Disclosed is a deflection yoke (24) mounted around a glass bulb (20) of a CRT (10) so as to cover a predetermined area of the glass bulb. The predetermined area is where an outer shape of the glass bulb smoothly goes from circular to substantially rectangular along a tube axis of the CRT. The deflection yoke includes a horizontal deflection coil (40) disposed in a shape to fit with the outer shape of the glass bulb, and a funnel-shaped ferrite core (38) disposed to surround the horizontal deflection coil. The inner shape of the ferrite core is circular throughout a length of the ferrite core.
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