An object of the present invention is to estimate the position and behavior of a target person with high accuracy without taking an image. The estimation system 200 includes a first sensor 210 that detects the amount of activity of the subject person indoors, that is, the first activity amount, and a second sensor 211 that detects the amount of activity of the subject person that is located on the indoor bed B, which is the first 2 activity amount； and an estimation device 100 that estimates a target person in a position associated with the room based on the first activity amount detected by the first sensor 210 and the second activity amount detected by the second sensor 211. At least one of a position and an action, and outputs an estimated result of the estimation. The first sensor 210 and the second sensor 211 are sensors other than the two-dimensional image sensor.本發明之課題在於不進行拍攝而精度良好地推定對象者之位置及行動。推定系統200包含：第1感測器210，其檢測對象者在室內之活動量即第1活動量；第2感測器211，其檢測位於室內之床B上之對象者之活動量即第2活動量；及推定裝置100，其基於第1感測器210檢測到之第1活動量、及第2感測器211檢測到之第2活動量，推定與室內關聯之位置中之對象者之位置及行動之至少一者，而輸出所推定之推定結果。又，第1感測器210及第2感測器211為2維影像感測器除外之感測器。
