An identification system includes a facility-side device and a transmitter which is carried by a registered individual and transmitting an identification signal containing identification information. The facility-side device includes: an identification signal receiving device receiving the identification signal transmitted from the transmitter; an identification information storage unit in which identification information assigned to the transmitter carried by the registered individual is previously stored; an event detection unit detecting an occurrence of an event; and an individual identification unit determining whether the individual present in the detection area is the registered individual by comparing the identification information, which is exhibited by the identification signal received during a detection time zone, with the identification information stored in the identification information storage unit. The detection time zone is determined according to a detection time of the occurrence of the event and includes at least the detection time of the occurrence of the event.