A power supply unit for an aerosol inhaler includes: a power supply able to discharge power to a load for generating an aerosol from an aerosol source； a connector able to be electrically connected to an external power supply； and a charger configured to be able to convert power which is input from the connector into charging power for the power supply. The power supply unit further includes a first zener diode which is provided between the connector and the charger so as to be connected in parallel with the charger, and the first zener diode is connected so as to be closer to an input terminal of the charger than to an output terminal of the connector.
