This invention, in order for the hipbone region of the seat board in the lower part to be sunk or to penetrated, or, the hipbone positioning section of the pair which was formed, from the side of the Pelvis hipbone to tilt in crotch joint direction of the femur and to include the side support section of the left and right symmetrical pinnate pair which is connected with the straight line and the curved surface, by the fact that the structure which induces the Pelvis in correct position is formed, while being sat down in the seat board, to minimize the distortion of the Pelvis, to lose the pain of the hipbone without the hipbone region receiving pressure, by the fact that it supports around the bottom of the Pelvis to keep the Pelvis by bounce of the load of the upper body, the rear endIt is possible to tighten the bottom.< Selective figure >It is not本発明は、座板の坐骨部位が下方に陥没又は貫通されるように形成された一対の坐骨位置付け部、骨盤坐骨の側面から大腿骨の股関節方向に傾き直線や曲面で繋がる左右対称の羽状の一対の側面支持部を含み、骨盤を正位置に誘導する構造を形成することで、座板に座っている間に骨盤の歪みを最小化し、坐骨部位が圧迫を受けることなく坐骨の痛みをなくし、骨盤の下端周囲を支えることで上半身の荷重の反発力で骨盤を保持し、尻の下端部を引き締めることができる。【選択図】なし
