A load measuring device for measuring a load applied to the lumbar spine, which reflects a first measurement unit for measuring a first physical quantity reflecting the posture of the upper body of the person to be measured and a degree of muscle tension for maintaining the posture. A second measurement unit that measures the second physical quantity, and a calculation unit that calculates a value of a load on the measurement subject's waist based on the first physical quantity and the second physical quantity. In the measurement apparatus, the first measurement unit may measure the inclination of the upper body toward the front side as the first physical quantity.腰椎に掛かる負荷を測定する負荷測定装置であって、被測定者の上体の姿勢を反映した第１の物理量を測定する第１の測定部と、姿勢を維持する筋肉の緊張の程度を反映した第２の物理量を測定する第２の測定部と、第１の物理量および第２の物理量に基づいて、被測定者の腰に掛かる負荷の値を算出する算出部とを備える。上記測定装置において、第１の測定部は、第１の物理量として、上体の前面側への傾きを測定してもよい。
