To surely hold and ID control function by improving a conventional RFID system as to a behavior in a moment of going out from a facility building, in which monitoring by the staff for a dementia patent of a wandering habit is limited, and by solving a problem of a limit as to obliged carrying of a conventional sensor.

An IC circuit of an ID tag and a coil thereof are protected by a flexible material, an antenna part of a reader writer is separated from the reader writer and protected by resin, installation is allowed thereby in a place where it is impossible to be installed in the prior art, a cost is reduced thereby, and control is allowed thereby for a person going to pass through a gateway to an outside. ID control is surely conducted inexpensively under the condition where actual feeling of carrying security equipment is not felt by equipping the elastic ID tag to shoes or the like.