A charging status display circuit is used in an electronic device. The electronic device includes a power supply circuit, a rechargeable battery, and an interface circuit capable of electrically connecting with the rechargeable battery. The electronic device is powered by either the power supply circuit or the rechargeable battery. The rechargeable battery is charged by the power supply circuit via the interface circuit. The charging status display unit includes a light emitting diode for indicating whether the rechargeable battery is being charged, and a surface-contact diode for clamping a voltage between the light emitting diode and the interface unit at a predetermined value. The light emitting diode is connected in series between the power supply circuit and the interface circuit. The surface-contact diode is connected in parallel with the light emitting diode.