To provide a method and apparatus for measuring the arrival angle, wherein the downsizing and a low power consumption can be realized and there is no need to eliminate the influence of the mutual coupling between antennas.

An antenna 20, a baseband signal generator 21, a reverse modulator circuit 22, a serial-parallel converter 23 and an arrival angle estimating circuit 24 are provided, the antenna is moved at a fixed velocity v at a fixed angle with respect to arrival wave, a signal received by the antenna 20 for every prescribed time Ts is converted (21) into a baseband signal, oppositely modulated (22), and converted (23) into a parallel signal, the parallel signal received every time Ts is regarded as a signal received by a plurality of antennas disposed with fixed spacings d and the direction of the arrival wave, is measured in the arrival angle estimating circuit 24.