Electromagnetic induction heating device

An electromagnetic induction heating device, comprising a rotator in which a plurality of magnets is arranged in a manner that the same poles are positioned on a side of an object to be heated, and a rotation drive part for rotating the rotator, and heating the object to be heated by an induction current which is generated by rotating the rotator by a rotation number at which the induction current is generated in the object to be heated with rotation, wherein

• an interval between the magnets adjacent in a direction in which the rotator is rotated is 20 mm or more and 45 mm or less,
• a distance from the object to be heated to the magnets of the rotator is 12 mm or less in the heating,
• the object to be heated is made of a material which generates an eddy current by changing a magnetic field,
• the plurality of magnets has
• a cylindrical shape in which a diameter is 5 mm or more and 25 mm or less and a height is 10 mm or more and 40 mm or less,
• a height of 0.5 time or more and 2 times or less of the diameter, and
• a magnetic flux density of 400 mT or more and 600 mT or less, and
• the plurality of magnets is mounted to the rotator via a height adjustment part for adjusting errors of height of the magnets to uniformize the heights of the magnets on the magnet surface.