To correct phase errors of weight coefficients in an adaptive array antenna.

A BB input part 116 inputs baseband received signals 300. An initial value calculation part 10 calculates a correlation value 312 in the interval of a training signal 302 by correlation processing between the baseband received signals 300 and the training signal 302. A phase error estimation part 12 outputs a phase error signal 304 from the baseband received signals 300 and the training signal 302. A weight calculation part 120 compensates the correlation value 312 by the phase error signal 304 to obtain initial weighting coefficients 310 at the end of the interval of the training signal 302. The initial weighting coefficients 310 are updated in the interval of a data signal. A synthesizing part 118 weights the baseband received signals 300 with the weighting coefficients 310 and then sums them up.