PURPOSE: To improve the transmission quality by providing a control means receiving a phase difference signal and sending a control signal to reduce a symbol phase difference of the signal relating to a reception path before selective diversity reception processing to a variable delay circuit.

CONSTITUTION: When a delay BB signal Sm is delayed, a phase comparator circuit 28 and an averaging circuit 30 sends a control signal So decreasing the delay of a 1st variable delay circuit 26a and sends a control signal Sp increasing the delay of a 2nd variable delay circuit 26b. Thus, a symbol phase difference between the delay BB signals Sm, Sn by the closed loop control using the control signals So, Sp to cause equilibrium, that is, to make the phase difference zero. Thus, the symbol phase of the delay BB signals Sm, sn is not jumped at each switching of a switch circuit 22, the phase of an eye aperture is not jumped and a demodulation signal Sr decreasing an error rate characteristic effectively is obtained to improve the transmission quality.