POWER SUPPLY UNIT FOR AEROSOL INHALER AND AEROSOL INHALER

A power supply unit for an aerosol inhaler that causes an aerosol generated from an aerosol source to pass through a flavor source to add a flavor component of the flavor source to the aerosol includes a power supply configured to be dischargeable to a first load configured to heat the aerosol source, and a processing device configured to determine a remaining amount of a flavor component contained in the flavor source based on a time of discharging from the power supply to the first load and a variable different from the time in a period during which the discharging is performed.