A power supply device that is capable of suppressing complexity of the circuit structure and increasing in the substrate area for the impedance adjustment configuration is provided. The power supply device includes a power supply antenna, supplying a power to a power receiving device, a reactance adjustment part, adjusting a reactance of the power supply antenna; a power source, supplying a voltage to the power supply antenna; and a controller, controlling the reactance adjustment part and the voltage of the power source.