A door latch power supply device configured to be connected to an actuator and an external power supply, the actuator providing a latched state in which a door is latched and an unlatched state in which the door is not latched, the door latch power supply device comprising: an electricity storage unit; a charger connected to a charging path of the electricity storage unit; a discharger connected to a discharging path of the electricity storage unit; a contactless power receiver connected to the charger and configured to receive power without contact; an input port, the input port being configured to be connected to the external power supply; an output port connected to the discharger, the output port being configured to be connected to the actuator; and an operation signal receiver configured to receive an operation signal sent in response to an operation for opening the door, wherein while an input voltage input to the input port is lower than a first input threshold, the charger is configured to operate using power supplied from the contactless power receiver so as to cause a storage voltage (Vca) of the electricity storage unit to become a second storage voltage value, and then the discharger is configured to output power stored in the electricity storage unit to the output port to place the actuator in the unlatched state in response to the operation signal received by the operation signal receiver, characterized in that the input port is connected to the charger, wherein while the input voltage input to the input port is higher than or equal to the first input threshold, the charger is configured to operate using power supplied from the external power supply so as to cause the storage voltage (Vca) of the electricity storage unit to become a first storage voltage value, and the discharger is configured to output power stored in the electricity storage unit to the output port to place the actuator in the unlatched state in response to the operation signal received by the operation signal receiver, and the second storage voltage value is higher than the first storage voltage value. an electricity storage unit; a charger connected to a charging path of the electricity storage unit; a discharger connected to a discharging path of the electricity storage unit; a contactless power receiver connected to the charger and configured to receive power without contact; an input port, the input port being configured to be connected to the external power supply; an output port connected to the discharger, the output port being configured to be connected to the actuator; and an operation signal receiver configured to receive an operation signal sent in response to an operation for opening the door, wherein while an input voltage input to the input port is lower than a first input threshold, the charger is configured to operate using power supplied from the contactless power receiver so as to cause a storage voltage (Vca) of the electricity storage unit to become a second storage voltage value, and then the discharger is configured to output power stored in the electricity storage unit to the output port to place the actuator in the unlatched state in response to the operation signal received by the operation signal receiver, characterized in that the input port is connected to the charger, wherein while the input voltage input to the input port is higher than or equal to the first input threshold, the charger is configured to operate using power supplied from the external power supply so as to cause the storage voltage (Vca) of the electricity storage unit to become a first storage voltage value, and the discharger is configured to output power stored in the electricity storage unit to the output port to place the actuator in the unlatched state in response to the operation signal received by the operation signal receiver, and the second storage voltage value is higher than the first storage voltage value.