To provide a magnetic coupling device for reducing magnetic leakage and allowing miniaturization easily.

The magnetic coupling device is provided that includes a magnetic core, a primary coil having a conductive layer wound around the magnetic core and insulated from the magnetic core and receiving an input electric signal, a secondary coil having a conductive layer wound around the magnetic core and insulated from the magnetic core and for outputting a mutual induction electromotive force caused by variations of magnetic flux to be generated by the primary coil, a converting circuit provided on the magnetic core and for outputting a signal responding to a rise or fall of the input electric signal toward the primary coil, and a reverse converting circuit provided on the magnetic core and for outputting an output electric signal responding to a rise or fall in response to output of the secondary coil.

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