To correctly determine completion of evacuation, issue a notification to prompt the evacuation when the evacuation is not completed, and stop the notification when the evacuation is completed.
An entrance/exit sensor 2 is disposed at an doorway of each room, and a population registration portion 8 starts operation of the entrance/exit sensor 2 in an initial state in which the number of persons staying in each room is specified. When the entrance/exit sensor 2 detects an entrance, the population registration portion 8 adds the value of the number of detected persons to the value of the number of persons staying in the room, when the entrance/exit sensor 2 detects an exit of persons, the population registration portion 8 subtracts the value of the number of detected persons from the value of the number of persons staying in the room, thereby recording the value of the number of persons staying in the room. In a case where an emergency happens, a control portion 5 releases at a time the electric locks 1 of rooms where the value of the number of persons is one or more, and continuously issues the notification portion 3 to prompt the evacuation until there are no rooms where the value of the number of persons is one or more.