PROBLEM TO BE SOLVED: To provide a motion measuring device that removes influence such as breathing magnitude (depth) or periodic variation, and accurately detects wearer's posture and motion such as stooping.SOLUTION: A motion measuring device 10 is provided in a sheet material 2 attached to a human body and measures wearer's motion. The motion measuring device has: calculation means 13 having a conductive stretchable material 12 comprising multiple linear members 11 (11A, 11B) along the deformation direction of the sheet material 2, incorporated in the sheet material 2 so that the linear members 11 may become parallel to each other, and calculating a difference of an electric resistance value from the linear members 11 where each electric resistance changes by deformation to the surface direction of the sheet material 2； and measuring means 14 for measuring the wearer's motion from calculation results of this calculation means 13.SELECTED DRAWING: Figure 1【課題】呼吸の大小（深さ）又は周期変動といった影響を排除して、猫背になる等の装着者の姿勢や動作を正確に検出する。【解決手段】人体に装着されるシート材２に設けられて装着者の動作を測定する動作測定装置１０であって、シート材２の変形方向に沿う複数の線状体１１（１１Ａ・１１Ｂ）からなる導電性伸縮材１２を有し、該線状体１１が互いに平行となるようにシート材２に組み込まれて、該シート材２の面方向への変形によってそれぞれの電気抵抗が変化する該線状体１１からの電気抵抗値の差を演算する演算手段１３と、この演算手段１３の演算結果から装着者の動作を測定する測定手段１４と、を有する。【選択図】図１
