The lumbago prevented apron that used Ti-Ni superelastic alloy (KIOKALLOY, Daido Steel, Co., Ltd) was developed. The apron prevented lumbago by generating the power by superelastic components. The superelastic components were made from five Ti-Ni superelastic wires of 1.8mm in diameter and 400mm in length. Each three superelastic components were arranged right and left side of the apron. The transformation temperatures were measured by differential scanning calorimetry (DSC). From DSC measurement, this alloy showed the superelastic behavior at room temperature. The bending fatigue characteristics of superelastic components were investigated by fatigue tester. The maximum strain ration of bending fatigue test was 1.8%. Fatigue lives of the superelastic components were about 10,000 times.