A digital demodulator needing no absolute phasing circuit. A known-pattern BPSK signal generator (6) generates the same known-pattern BPSK signal as the known-pattern BPSK signal in a received digital demodulated wave in synchronism with the known-pattern BPSK signal in the received digital demodulated wave. A carrier-reproducing phase-error detecting circuit (7) has a phase error table where one of the reference phases in a signal point position of a demodulation baseband signal is made the convergence point. A phase difference voltage corresponding to the phase difference between the phase determined from the signal point position and the phase convergence point is sent out. By enable-controlling a carrier-reproducing loop filter (8) according to the known-pattern BPSK signal outputted from the known-pattern BPSK signal generator (6), the phase difference voltage is smoothed. Carrier reproduction is performed while controlling the frequency of the reproduced carrier according to the smoothed output so that the phase in the signal point position coincides with the phase convergence point.
