An object of the present invention is to provide an electronic device which is capable of conducting a proximity noncontact communication even if charging of a secondary battery is not fully completed and also whose secondary battery never falls into an overdischarge state during the proximity noncontact communication. An electronic device (2) employs a secondary battery (28), which is rechargeable by a charger (3) that gives a charge of electricity in a noncontact manner, as a power source, and is capable of conducting a proximity noncontact communication with the charger (3). The electronic device (2) repeats a charging process, in which this equipment charges the secondary battery (28) for a predetermined period (Tb1) by receiving a supply of an electric power from the charger (3) via a noncontact power-receiving secondary coil (22), and a communication process, in which this equipment conducts a data communication for a predetermined period (Ta1)) when a voltage of the secondary battery (28) at a time of charging start is below a predetermined value (Va), and also repeats a charging process, in which this equipment charges the secondary battery (28) for a predetermined period (Tb2) by receiving a supply of the electric power from the charger (3) via the noncontact power-receiving secondary coil (22), and a communication process, in which this equipment conducts the data communication for a predetermined period (Ta2)(>Ta1) when the voltage of the secondary battery (28) at a time of charging start is more than a predetermined value (Va).