PROBLEM TO BE SOLVED: To three-dimensionally detect postures and distortions of various parts of a body from a natural standing behavior in daily activities of a subject. SOLUTION: In a body posture detection system 1, a sensor 4 arranged at different measurement parts of the body of a subject detects accelerations in three axial directions of an orthogonal three-dimensional coordinate system at a predetermined timing, and an arithmetic processing unit. 5 calculates the moving distances in the three-axis directions by calculating the accelerations obtained from the respective sensors, and calculates the reference position of each sensor in the initial posture of the body of the subject and the coordinate position calculated at each timing. Based on this, the posture of the body of the subject with respect to the initial posture and / or its distortion is three-dimensionally determined. [Selection diagram] Figure 1【課題】被検者の日常行動における自然な立居振舞から身体の様々な部位について姿勢、その歪みを３次元的に検出する。【解決手段】身体姿勢検知システム１は、被検者の身体の異なる測定部位に配置されたセンサー４が、直交３次元座標系の３軸方向の加速度を所定のタイミングで検出し、演算処理部５が、各センサーから取得される加速度を演算処理して３軸方向の移動距離を算出し、被検者の身体の初期姿勢における各センサーの基準位置と各タイミングで算出される座標位置とに基づいて、被検者の身体の初期姿勢に対する姿勢及び／又はその歪みを３次元的に判定する。【選択図】図１
