An induction heating device for induction-heating a workpiece (W) on which areas to be heated (H1, H2) are established extending in one direction, and when the areas to be heated (H1, H2) are induction-heated, a side of one edge (c1) and a side of another edge (d1) of the areas to be heated (H1, H2) exhibit different deformation amount, comprising: heating coils arranged and configured to face a portion of the areas to be heated (H1, H2); a workpiece supporting member equipped with rotating rollers arranged in a radial fashion on the side of the tip of a plurality of radial racks extending in a radial direction as relative transfer means, the workpiece (W) being moved along the shape of a ring by rotating each of the rotating rollers ; a position detecting means for detecting measurement positions of the workpiece (W) other than the areas to be heated (H1, H2) during a heating period; and a displacing means equipped with a posture control unit for adjusting a relative position between the workpiece (W) and the heating coils by controlling the operation of the displacing means based on the measurement positions detected by the position detecting means , characterised in that the displacing means is further arranged and configured to change a relative angle between the workpiece (W) and the heating coils , wherein the heating coils are disposable by the displacing means so as to correspond to the areas to be heated (H1, H2) during the heating period by correcting the measurement positions obtained by the position detecting means during the heating period based at least on a shape of the workpiece (W), and by adjusting the relative position and changing the relative angle between the workpiece (W) and the heating coils so as to correspond to the corrected measurement positions. heating coils arranged and configured to face a portion of the areas to be heated (H1, H2); a workpiece supporting member equipped with rotating rollers arranged in a radial fashion on the side of the tip of a plurality of radial racks extending in a radial direction as relative transfer means, the workpiece (W) being moved along the shape of a ring by rotating each of the rotating rollers ; a position detecting means for detecting measurement positions of the workpiece (W) other than the areas to be heated (H1, H2) during a heating period; and a displacing means equipped with a posture control unit for adjusting a relative position between the workpiece (W) and the heating coils by controlling the operation of the displacing means based on the measurement positions detected by the position detecting means , characterised in that the displacing means is further arranged and configured to change a relative angle between the workpiece (W) and the heating coils , wherein the heating coils are disposable by the displacing means so as to correspond to the areas to be heated (H1, H2) during the heating period by correcting the measurement positions obtained by the position detecting means during the heating period based at least on a shape of the workpiece (W), and by adjusting the relative position and changing the relative angle between the workpiece (W) and the heating coils so as to correspond to the corrected measurement positions. <EOS>