The present invention is compact, effective training, to provide a quick start is O leg braces. A O leg braces 1, a pair, a foot rest portion 10 which is placed the users feet from the upper surface side is fixed to the footrest section 10, section placed at least a portion of the foot a rotating portion 20 that protrudes from the lower surface 10, with a, the rotating portion 20, a fixing portion 21 fixed to the footrest section 10 is combined fixed portion 21 and rotatably engaged, footrest portion a 10 of the bottom 12a floor abuts the floor contact surface 22a in a position projecting from, includes a shaft portion 22 extending in the vertical direction, and the fixing portion 21 is fixed to the footrest section 10, mind is rotated around the shaft 22 in a predetermined direction, back in the opposite direction force is generated from the predetermined direction.BACKGROUND 3【課題】コンパクトで、効果的なトレーニングを、素早く始められるO脚矯正器具を提供すること。【解決手段】O脚矯正器具1は、左右一対であり、上面側から使用者の足が載置される足乗せ部10と、足乗せ部10に固定され、その少なくとも一部が足乗せ部10の下面側から突出する回動部20と、を備え、回動部20は、足乗せ部10に固定される固定部21と、固定部21と回動自在に係合され、足乗せ部10の底面12aから突出した位置に床面と当接する床当接面22aを有し、垂直方向に延びる軸部22と、を有し、足乗せ部10に固定される固定部21には、軸部22を中心に所定方向に回動させたきに、所定方向とは反対方向に戻る力が発生する。【選択図】図3