Abstract: A tuner circuit is basically composed of: a series of a low-band coil and a high-band coil disposed on the signal side; a series of a low-band coil and a high-band coil disposed on the earth side; and a switching diode disposed between a junction of the low-band coil and high-band coil on the signal side and another junction of the low-band coil and high-band coil on the earth side. Further, the junction of the low-band coil and high-band coil on the signal side is connected to a band switching terminal via a first bias resistor while an input side terminal of the low-band coil on the signal side is connected with a second bias resistor.