In a wireless receiving apparatus, comprising a plurality of antennas and a plurality of receivers each of which is provided for each antenna, each receiver uses a received signal that was received by the receiving antenna that is connected to it, and received signals that were received by the other receiving antennas, to calculate probability of a signal that was transmitted from a specified transmitter, and judges the signal that was transmitted from the transmitter based on that probability. The receivers calculate the probability using an equation that calculates the probability based on the posteriori probability that the signal transmitted from the transmitter is +1, and the posteriori probability that the signal transmitted from the transmitter is -1.