PROBLEM TO BE SOLVED: To provide an instrument for prevention of a disease of a cartilage and the like in a knee and for a treatment for the knee.SOLUTION: An instrument includes a pillow-like object 1 for being fixed to the inside of a knee, a belt 2 for connecting an ankle and a thigh or a waist together, and a pump 3 for feeding a fluid such as air. The pillow-like object 1 is fixed to the inside of the knee, and the ankle and the thigh or the waist are connected together by the belt 2. A knee joint is stretched by feeding the air and the like into the pillow-like object 1 or the belt 2, or both of them.COPYRIGHT: (C)2014,JPO&INPIT【課題】膝の軟骨等の疾病予防、治療の器具とするもの。【解決手段】膝の内側に固定する1枕状物体、足首と大腿もしくは腰をつなぐ2ベルト、空気等流体を送る3ポンプ。膝の内側に1枕状物体を固定し、2ベルトにより足首と大腿もしくは腰をつなぐ。 1もしくは2、もしくは両方の内部に空気などを送ることで膝関節の引き伸ばしをする【選択図】図1