First varactor diodes for changing tuning frequency are provided at tuning circuits, a second varactor diode for changing an oscillating frequency is provided at an oscillator, tuning voltages between both ends of the first varactor diodes become equal to the tuning voltage between both ends of the second varactor diode when a television tuner receives a television signal, and the tuning voltages between both ends of the first varactor diodes become lower than the tuning voltage between both ends of the second varactor diode when the television tuner receives a FM broadcasting signal.