PROBLEM TO BE SOLVED: To provide a technique which monitors a fall of a subject by inexpensive and simple structure.SOLUTION: An activity quantity measurement device is attached to a subjects body, and measures activity quantity of the subject. The activity quantity measurement device comprises: acceleration measurement means which measures acceleration associated with body movements of the subject monitoring means which monitors whether or not a detection value measured by the acceleration measurement means exceeds a predetermined threshold angle measurement means which measures an angle of a main unit of the activity quantity measurement device and fall determination means which, when the monitoring means determines that the detection value exceeds the predetermined threshold, determines whether or not the subject has fallen on the basis of the angle of the main unit measured by the angle measurement means.COPYRIGHT: (C)2015,JPO&INPIT【課題】低コスト且つ簡単な構成で被検者の転倒を監視できるようにした技術を提供する。【解決手段】活動量計は、被検者の身体に装着され、その活動量を計測する。ここで、活動量計は、前記被検者の体動に伴った加速度を計測する加速度計測手段と、前記加速度計測手段により計測された検出値が所定の閾値を越えるか否かを監視する監視手段と、前記活動量計の本体部の角度を計測する角度計測手段と、前記監視手段により前記検出値が前記所定の閾値を越えたと判定された場合、前記角度計測手段により計測された本体部の角度に基づいて、前記被検者が転倒したか否かを判定する転倒判定手段とを具備する。【選択図】 図2
