Elderly who are living alone is increasing. It has become a serious social problem now. Therefore, The monitoring from a remote location is required. System for detecting an abnormality of usage such as gas and electricity has been already proposed. However, there are problems such as not being able to check in real time the status of the resident for these systems. Therefore, we propose a system of watching the elderly who live alone that uses an infrared sensor that can be measured in a non-contact.