This paper describes availability of a human detection device to protect the elderly in a nursing home from a tumbling over. The device including an infrared sensor with Fresnel lens was installed in the private room of the nursing home and connected to emergency call for nurses. When the low-grade dementia elderly appears in front of the infrared sensor at night, the device calls a nurse automatically. After installation of the device, the number of tumbles decreased from 2 to 0 a month.
