An induction heating device configured to inductively heat a passing conductor plate, the induction heating device comprising; a first coil configured to generate a magnetic field in a plate thickness direction of the conductor plate by an alternating current flowing therethrough; and a second coil configured to generate a magnetic field in the plate thickness direction of the conductor plate by an alternating current flowing therethrough, wherein the first coil and the second coil are positioned to sandwich the conductor plate therebetween, the first coil and the second coil are substantially the same in position in a passing direction of the conductor plate, the first coil and the second coil are configured to generate magnetic fields (H1,H2) that are opposite to each other in direction in the plate thickness direction of the conductor plate by the alternating currents, to generate eddy currents (Ie1,Ie2) inside the conductor plate by the magnetic fields (H1,H2) that are opposite to each other in the plate thickness direction of the conductor plate, and to inductively heat the conductor plate by the eddy currents (Ie1,Ie2), and the first coil and the second coil are configured to make the inductance of the induction heating device be close to 0 (zero) even when the induction heating device is operated in a state where there is no conductor plate, wherein each of the eddy currents (Ie1,Ie2) forms one closed loop passing through region on a first surface side of the conductor plate and region on a second surface side of the conductor plate sandwiching center in plate thickness direction of the conductor plate, wherein as the alternating currents, alternating currents at a frequency f in a range where Expression below is satisfied are applied to the first coil and the second coil, and thereby the magnetic fields (H1,H2) that are opposite to each other in direction are generated in the plate thickness direction of the conductor plate from the first coil and the second coil, wherein in Expression, d is a plate thickness [m] of the conductor plate and δ is a depth of penetration of the current in the conductor plate and is expressed by Expression below, and wherein in Expression, ρ is resistivity [Ω · m] of the conductor plate, f is the frequency [Hz] of the alternating currents, and μ s is relative permeability [-] of the conductor plate: [Mathematical expression 1] δ ≦ d δ = 503 ρ μ s f a first coil configured to generate a magnetic field in a plate thickness direction of the conductor plate by an alternating current flowing therethrough; and a second coil configured to generate a magnetic field in the plate thickness direction of the conductor plate by an alternating current flowing therethrough, wherein the first coil and the second coil are positioned to sandwich the conductor plate therebetween, the first coil and the second coil are substantially the same in position in a passing direction of the conductor plate, the first coil and the second coil are configured to generate magnetic fields (H1,H2) that are opposite to each other in direction in the plate thickness direction of the conductor plate by the alternating currents, to generate eddy currents (Ie1,Ie2) inside the conductor plate by the magnetic fields (H1,H2) that are opposite to each other in the plate thickness direction of the conductor plate, and to inductively heat the conductor plate by the eddy currents (Ie1,Ie2), and the first coil and the second coil are configured to make the inductance of the induction heating device be close to 0 (zero) even when the induction heating device is operated in a state where there is no conductor plate, wherein each of the eddy currents (Ie1,Ie2) forms one closed loop passing through region on a first surface side of the conductor plate and region on a second surface side of the conductor plate sandwiching center in plate thickness direction of the conductor plate, wherein as the alternating currents, alternating currents at a frequency f in a range where Expression below is satisfied are applied to the first coil and the second coil, and thereby the magnetic fields (H1,H2) that are opposite to each other in direction are generated in the plate thickness direction of the conductor plate from the first coil and the second coil, wherein in Expression, d is a plate thickness [m] of the conductor plate and δ is a depth of penetration of the current in the conductor plate and is expressed by Expression below, and wherein in Expression, ρ is resistivity [Ω · m] of the conductor plate, f is the frequency [Hz] of the alternating currents, and μ s is relative permeability [-] of the conductor plate: [Mathematical expression 1] δ ≦ d δ = 503 ρ μ s f