PROBLEM TO BE SOLVED: To accurately calculate the angle of the upper body of a person being measured, not only in a still period but also during an exercise such as walking and running.SOLUTION: On the basis of a gravitational acceleration obtained from sensor data measured by an acceleration sensor 21, a specific operation period selector 14 selects sensor data measured in a specific operation period in which a foot of a person being measured is grounded to the ground surface from among the sensor data. An inclination angle calculator 15 calculates the inclination angle of the acceleration sensor 21 on the basis of the selected sensor data.SELECTED DRAWING: Figure 1【課題】静止期間中のみならず、歩行や走行といった運動においても、被測定者上体の角度を精度よく算出する。【解決手段】特定動作期間選択部１４が、加速度センサ２１で測定されたセンサデータから求めた重力加速度に基づいて、これらセンサデータのうちから、被測定者の足が地面に接地している特定動作期間に測定されたセンサデータを選択し、傾き角度算出部１５が、選択されたセンサデータに基づいて加速度センサ２１の傾き角度を算出する。【選択図】 図１
