A power transmission device for use with a power reception device having a power reception coil includes a power transmission coil, a power transmission circuit, a communication circuit, and a control circuit. The power transmission coil is configured to be magnetically coupled to a power reception coil of a power reception device. The power transmission circuit includes a switching element and is configured to switch the switching element to apply alternating current to the power transmission coil. The communication circuit is configured to establish communication with the power reception device. The control circuit is configured to control switching of the power transmission circuit, determine whether or not a load of the power reception device is greater than a threshold based on an output voltage from the switching element and a determination criterion, and provide a notification to the power reception device from the communication circuit.