To stand in for reporting to a remote monitoring device and identify the presence of an abnormal state of building facility, according to an external environmental state, when a failure occurs in remote monitoring.

A remote monitoring failure reporting alternate system 10 includes a backup power supply 16, capable of supplying urgent power in service interruption, the abnormality occurrence reporting device 18 for notifying the remote monitoring device 22 via a public line 20 of, as an abnormal signal, the fact that an urgent button 14 of a car 8 of an elevator has been pushed; a sound device 30, light-emitting device 32, and radio transmitting device 34 disposed on the roof or the like of a building 4, in order to output an abnormality occurrence signal, instead of the abnormality occurrence reporting device 18, when it cannot report the abnormal signal; a sensor 36 for detecting the external environmental state of the building 4;, and a controller 50 for changing the output level of an abnormality occurrence signal outputting means corresponding to the external environmental state.