intrudes across the white line into the railway track side in embodiment 1 the receiving regions of the multiple receiving antennas included in the intruding object detection system are set so as not to overlap with each other in contrast to this the present embodiment will be explained in a case where the receiving regions of the multiple receiving antennas included in the intruding object detection system are set so as to overlap with each other fig1 illustrates intruding object detection apparatus 300 according to embodiment 2 of the present invention in intruding object detection apparatus 300 illustrated in fig1 the same elements as those in embodiment 1 fig4 are designated with the same reference signs and repetitive descriptions thereon will be omitted specifically intruding object detection apparatus 300 illustrated in fig1 involves different operations of detection processing section 301 and newly includes object positioning section 302 in comparison with intruding object detection apparatus 100 illustrated in fig4 intruding object detection system 10 according to the present embodiment includes intruding object detection apparatus 300 instead of intruding object detection apparatus 100 illustrated in fig1 in intruding object detection system 10 according to the present embodiment the antenna half value angle of each of multiple receiving antennas 110 is set so as to overlap with the receiving region of another receiving antenna 110 that is multiple receiving antennas 110 are mounted so that at least two receiving antennas 110 may receive reflected waves from an object for intrusion detection fig1 explains mounting conditions for receiving antennas 110.