A remote monitoring system for elevator has a plurality of remote monitors for individually monitoring the running states of a plurality of elevators installed in a building, transmits running state data from the remote monitoring system via a communal public telephone line to a communal monitoring center, and allows communication between interphones, provided in the carriages of the elevators, and the monitoring center via the public telephone line. Each of the plurality of remote monitors comprises a memory unit which stores incoming time data of different incoming times, the remote monitor performing incoming controls after independently determining call signals from the monitoring center, based on the incoming time data stored in the memory unit. Furthermore, a first switching unit cuts off the auxiliary power when there has been no irregularity in the monitoring information of the elevator after the operating power has been supplied for a fixed period of time from an auxiliary power instead of the main power when the main power fails; and a second switching unit is driven by power from an interphone battery, and re-injects the auxiliary power when an emergency call button has been pressed.