POWER SUPPLY UNIT FOR AEROSOL GENERATION DEVICE

A power supply unit (102) for an aerosol generation device (100) is provided. The power supply unit (102) includes an internal power supply (BAT) configured to hold power supplied to a heater (HT) configured to heat an aerosol source, a connector (23) connectable to an external power supply (CG), a controller (14) configured to control power supply from the internal power supply (BAT) to the heater (HT), and a first transistor (Q3) positioned on a first power supply path (301) between the connector (23) and a positive electrode (561) of the internal power supply (BAT). A current from the connector (23) is supplied to a source of the first transistor (Q3). A current from a drain of the first transistor (Q3) is supplied to the positive electrode (561) of the internal power supply (BAT). The controller (14) controls a voltage of a gate of the first transistor (Q3) to adjust power supplied from the external power supply (CG) to the internal power supply (BAT).