The landing of the moving human body is detected with high accuracy.The detection system comprises a detection section for optically detecting a moving human body, a displacement calculating section for calculating a time change of the detection result of the detection section, and a landing decision section for judging the landing of the human body based on the calculation result of the displacement calculating section.Diagram【課題】移動する人体の着地を高精度で検出する。【解決手段】検出システムは、移動する人体を光学的に検出する検出部と、検出部の検出結果の時間変化を算出する変位算出部と、変位算出部の算出結果に基づいて人体の着地を判定する着地判定部と、を備える。【選択図】図1