A wireless power feeding system comprising a charging control device and a charging device , the charging control device comprising: a switching unit configured to be capable of switching a connection state of a battery unit including a plurality of battery modules whose number is N × M (where N is an integer of 2 or more, and M is an integer of 1 or more); and a controller configured to control the switching unit so as to cause the switching unit to switch the connection state based on a power storage amount of the battery unit , wherein the switching unit is configured to be capable of switching the connection state between a first state in which all the battery modules are connected in series, and a second state in which N groups each including M battery modules connected in series are connected in parallel, the controller is configured to cause the switching unit to switch the connection state from the first state to the second state when the power storage amount becomes equal to or larger than a first connection switching value (Cthl) in a first charging method in which a current supplied to each of the plurality of battery modules decreases as the power storage amount increases, the controller is configured to transmit a current command value (Ic) instructing a value of a charging current supplied to the battery unit to the charging device that supplies the charging current based on the power storage amount and the connection state, and the controller is configured to receive a switching command for lowering an impedance of the battery unit from the charging device in a case where the connection state is the first state and in response to cause the switching unit to switch the connection state from the first state to the second state. a switching unit configured to be capable of switching a connection state of a battery unit including a plurality of battery modules whose number is N × M (where N is an integer of 2 or more, and M is an integer of 1 or more); and a controller configured to control the switching unit so as to cause the switching unit to switch the connection state based on a power storage amount of the battery unit , wherein the switching unit is configured to be capable of switching the connection state between a first state in which all the battery modules are connected in series, and a second state in which N groups each including M battery modules connected in series are connected in parallel, the controller is configured to cause the switching unit to switch the connection state from the first state to the second state when the power storage amount becomes equal to or larger than a first connection switching value (Cthl) in a first charging method in which a current supplied to each of the plurality of battery modules decreases as the power storage amount increases, the controller is configured to transmit a current command value (Ic) instructing a value of a charging current supplied to the battery unit to the charging device that supplies the charging current based on the power storage amount and the connection state, and the controller is configured to receive a switching command for lowering an impedance of the battery unit from the charging device in a case where the connection state is the first state and in response to cause the switching unit to switch the connection state from the first state to the second state. <EOS>