<p>A wireless apparatus (1) includes: an A/D converter (11) which samples an in-phase signal component and a quadrature signal component from a quadrature-modulated signal of analog form alternately; a digital quadrature demodulation unit (12) which applies digital quadrature demodulation to an output signal of the A/D converter (11) and outputs an in-phase signal and a quadrature signal; and an error detection unit (13) which, based on the in-phase and quadrature signals output from the digital quadrature demodulation unit (12), detects a time difference error between the sample timing of the in-phase signal component and the sample timing of the quadrature signal component.</p>
