The induction heating device that heats a heating medium includes a rotor having a rotation shaft, a heating part disposed to be opposed to the rotor at a distance, a magnetic flux generating part provided at the rotor to generate magnetic flux for the heating part, and a flow passage provided along the heating part to allow the heating medium to circulate. The flow passage has an inlet to supply the heating medium on one side in a direction along the heating part and an outlet to discharge the heating medium on the other side. The distance between the magnetic flux generating part and the heating part is larger on the outlet side than on the inlet side of the flow passage.