An induction heating system of metal plate having an induction coil formed connecting a conductor at a front surface side of the metal plate and a conductor at a back surface side so as to circle a width direction of the metal plate while having a distance from the surface of the metal plate and induction heating the metal plate passing through the inside of the circling induction coil, said system characterized by arranging at least two sections of said induction coil adjoining in a longitudinal direction of said metal plate, and, in a vertical projection when vertically projecting the conductors forming the induction coil at the front surface side and back surface side of said metal plate onto said metal plate, said front surface side conductor and back surface side conductor being arranged having a distance apart so as not to mutually overlap each other in a longitudinal direction of said metal plate at the center part of said metal plate at each of said at least two sections of the induction coil, and, further, at said adjoining at least two sections of the induction coil, said adjoining front surface side conductors (2a,3a) being in proximity in the longitudinal direction of the metal plate and said adjoining back surface side conductors (2b, 3b) being arranged to have a distance apart in the longitudinal direction of the metal plate more than the distance by which said adjoining front surface side conductors (2a,3a) are in proximity, or said adjoining back surface side conductors (2b,3b) being in proximity in the longitudinal direction of the metal plate and said adjoining front surface side conductors (2a,3a) being arranged to have a distance apart in the longitudinal direction of the metal plate more than the distance by which said adjoining back surface side conductors (2b, 3b) are in proximity. said system characterized by arranging at least two sections of said induction coil adjoining in a longitudinal direction of said metal plate, and, in a vertical projection when vertically projecting the conductors forming the induction coil at the front surface side and back surface side of said metal plate onto said metal plate, said front surface side conductor and back surface side conductor being arranged having a distance apart so as not to mutually overlap each other in a longitudinal direction of said metal plate at the center part of said metal plate at each of said at least two sections of the induction coil, and, further, at said adjoining at least two sections of the induction coil, said adjoining front surface side conductors (2a,3a) being in proximity in the longitudinal direction of the metal plate and said adjoining back surface side conductors (2b, 3b) being arranged to have a distance apart in the longitudinal direction of the metal plate more than the distance by which said adjoining front surface side conductors (2a,3a) are in proximity, or said adjoining back surface side conductors (2b,3b) being in proximity in the longitudinal direction of the metal plate and said adjoining front surface side conductors (2a,3a) being arranged to have a distance apart in the longitudinal direction of the metal plate more than the distance by which said adjoining back surface side conductors (2b, 3b) are in proximity.