A parameter adjustment unit 21 designates a design parameter value for a flux transformer. A transmission efficiency evaluation unit 22 calculates transmission efficiency BR corresponding to the design parameter value in accordance with a prescribed calculation expression. In particular, the transmission efficiency evaluation unit 22 calculates the transmission efficiency BR on the basis of (a) an electromotive force of a primary-side coil in which individual coil diameters of respective windings of the primary-side coil of the flux transformer are taken into account and (b) an induced magnetic field of a secondary-side coil in which individual coil diameters of respective winding layers of the secondary side coil of the flux transformer are taken into account.
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