A radio apparatus includes a receiver which receives a wirelessly transmitted signal as a reception signal, a transmitter which is provided in the vicinity of the receiver and generates a transmission signal having a frequency different from that of the reception signal, and a reception signal extracting unit which extracts a reception signal from an input signal containing the reception signal and the transmission signal, at a timing of a zero crossing of the transmission signal in the input signal, by using phase information including the phase of the transmission signal from the transmitter.