Abstract: A radar detector is provided including a microwave module, which converts a UHF signal to a RF signal, a RF module, which converts the RF signal to an IF signal, a demodulator, which demodulates the IF signal, and a signal processing controller, which receives a signal demodulated by the demodulator and performs an appropriate control for each constituting component. The microwave module includes an antenna, which receives a UHF signal, a first local oscillating unit, which includes an oscillator and a buffer amplifier, and a first mixing unit, which converts a signal received from the antenna to an RF signal. The first local oscillating unit is supplied with power by a single bias circuit.