PURPOSE: A focus unit for fly back transformer(FBT) is provided to allow a volume slider to be easily installed into the focus unit, and increase contact force of the volume slider by the press action of the rotating piece connected to the knob body. CONSTITUTION: A focus unit comprises a knob body(120) protruded from an FBT focus unit(110) and which has a rotating piece(130) formed integrally with the knob body; a slider coupling groove(140) formed at the bottom portion of the rotating piece which is extended downward from the knob body; a slider(150) inserted into the slide coupling groove so as to vary the volume; a central terminal piece formed by bending an end of the slider to be coaxial with the knob body so as to contact an output terminal; and a variable terminal piece formed by bending the other end of the slider and installed to contact the resistor pattern of a ceramic substrate(190) mounted within the focus unit.
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