A power receiving device, comprising: a power receiving antenna configured to receive an AC power from a power transmitting antenna of a power transmitting device; a rectifier circuit configured to convert the AC power into DC power; a first detection circuit configured to detect a value of the DC power; a load configured to consume the DC power; a battery configured to store the DC power; a second detection circuit configured to detect a charge level of the battery; a switching circuit configured to provide i) connection and disconnection between the rectifier circuit and the load, ii) connection and disconnection between the rectifier circuit and the battery, and iii) connection and disconnection between the load and the battery; and a control circuit configured to control the power receiving device, wherein the control circuit is configured to control the switching circuit to connect the rectifier circuit to the load, disconnect the rectifier circuit from the battery, and disconnect the load from the battery, wherein the control circuit is configured to determine whether the value of the DC power detected using the first detection circuit is less than or equal to a power threshold value, wherein the control circuit is configured such that, if the value of the DC power reaches less than or equal to the power threshold value corresponding to a low load condition, the control circuit determines that the AC power that is greater than or equal to a predetermined value is not required for driving the load so that the control circuit controls the switching circuit to connect the rectifier circuit to the load, connect the rectifier circuit to the battery, and connect the load to the battery and causes the battery to be charged and the load to be supplied from the rectifier circuit, wherein the control circuit is further configured such that, if the charge level of the battery is greater than or equal to a first charge level threshold value, the control circuit controls the switching circuit to disconnect the rectifier circuit from the load, disconnect the rectifier circuit from the battery, and connect the load to the battery, and drives the load by the DC power charged in the battery. a power receiving antenna configured to receive an AC power from a power transmitting antenna of a power transmitting device; a rectifier circuit configured to convert the AC power into DC power; a first detection circuit configured to detect a value of the DC power; a load configured to consume the DC power; a battery configured to store the DC power; a second detection circuit configured to detect a charge level of the battery; a switching circuit configured to provide i) connection and disconnection between the rectifier circuit and the load, ii) connection and disconnection between the rectifier circuit and the battery, and iii) connection and disconnection between the load and the battery; and a control circuit configured to control the power receiving device, wherein the control circuit is configured to control the switching circuit to connect the rectifier circuit to the load, disconnect the rectifier circuit from the battery, and disconnect the load from the battery, wherein the control circuit is configured to determine whether the value of the DC power detected using the first detection circuit is less than or equal to a power threshold value, wherein the control circuit is configured such that, if the value of the DC power reaches less than or equal to the power threshold value corresponding to a low load condition, the control circuit determines that the AC power that is greater than or equal to a predetermined value is not required for driving the load so that the control circuit controls the switching circuit to connect the rectifier circuit to the load, connect the rectifier circuit to the battery, and connect the load to the battery and causes the battery to be charged and the load to be supplied from the rectifier circuit, wherein the control circuit is further configured such that, if the charge level of the battery is greater than or equal to a first charge level threshold value, the control circuit controls the switching circuit to disconnect the rectifier circuit from the load, disconnect the rectifier circuit from the battery, and connect the load to the battery, and drives the load by the DC power charged in the battery.