The present invention provides VCO device, which comprises a local oscillation signal generating circuit for outputting a local oscillation signal, which corresponds to such a frequency signal of high-frequency signals received by an input terminal as belongs to a station select channel to be received, and a mixing circuit for mixing the high-frequency signal and the local oscillation signal, to output a base band signal. The local oscillation signal generating circuit includes an oscillator for oscillating the local oscillation signal, and a frequency reducing unit for outputting the local oscillation signal frequency oscillated by an oscillator, at ratio of 1/N times to the mixing circuit. By adjusting the ratio of 1/N times, the VCO device is set such that the local oscillation signal frequency and a transmitting radio frequency employed in a mobile telephone may not directly overlap each other.