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 control device configured to control at least one of charging and discharging of the power supply or 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 zener diode which is provided between the connector and the control device so as to be connected in parallel with the control device, and a maximum value of zener voltage of the zener diode is lower than a maximum operation guarantee voltage of the control device.
