PROBLEM TO BE SOLVED: To provide a measurement device of a bone density having higher measuring accuracy of the bone density of a bone under a skin, and possibly serving as a compact handy type one and to provide a measurement method of bone density using the same.SOLUTION: A measurement device of the bone density of a bone existing under a skin has a light irradiation part which irradiates a subject with light of a predetermined strength, filter means which removes scattered light reflected from a skin of the subject, light collection means of reflection light from which the scattered light is removed, and a light detection part which measures the strength of light collected by the light collection means.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2017,JPO&INPIT【課題】皮膚の下にある骨の骨密度の計測精度が高く、コンパクトなハンディタイプにもなる骨密度の計測装置及びそれを用いた骨密度の計測方法の提供を目的とする。【解決手段】皮膚の下側に存在する骨密度の計測装置であって、被検体に所定の強度の光を入射する光照射部と、前記被検体の皮膚から反射された散乱光を除去するフィルター手段と、前記散乱光が除去された反射光の集光手段と、当該集光手段にて集光された光の強度を計測する光検出部とを有することを特徴とする。【選択図】 図1