A power supply unit for an aerosol generation device, the power supply unit comprising: a first load configured to heat an aerosol source and has a correlation between a temperature and an electric resistance value; a second load configured to heat a flavor source configured to add a flavor component to aerosol generated from the aerosol source and has a correlation between a temperature and an electric resistance value; a power supply configured to discharge electricity to the first load and the second load; a circuit element (Rs1, Rs2) that has a predetermined electric resistance value; a switching element (SW4, SW6, SW8) configured to be switchable between a first state where the circuit element (Rs1, Rs2) and the first load are connected in series and a second state where the circuit element (Rs1, Rs2) and the second load are connected in series; an operational amplifier to which a voltage applied to the first load in a first series circuit formed of the circuit element (Rs1, Rs2) and the first load in the first state is input, and to which a voltage applied to the second load in a second series circuit formed of the circuit element (Rs1, Rs2) and the second load in the second state is input; and a processing device configured to detect a temperature of each of the first load and the second load based on output of the operational amplifier, wherein the processing device is configured to control the switching element (SW4, SW6, SW8) such that a temperature detection process of the first load based on the output of the operational amplifier and a temperature detection process of the second load based on the output of the operational amplifier are performed in different periods. a first load configured to heat an aerosol source and has a correlation between a temperature and an electric resistance value; a second load configured to heat a flavor source configured to add a flavor component to aerosol generated from the aerosol source and has a correlation between a temperature and an electric resistance value; a power supply configured to discharge electricity to the first load and the second load; a circuit element (Rs1, Rs2) that has a predetermined electric resistance value; a switching element (SW4, SW6, SW8) configured to be switchable between a first state where the circuit element (Rs1, Rs2) and the first load are connected in series and a second state where the circuit element (Rs1, Rs2) and the second load are connected in series; an operational amplifier to which a voltage applied to the first load in a first series circuit formed of the circuit element (Rs1, Rs2) and the first load in the first state is input, and to which a voltage applied to the second load in a second series circuit formed of the circuit element (Rs1, Rs2) and the second load in the second state is input; and a processing device configured to detect a temperature of each of the first load and the second load based on output of the operational amplifier, wherein the processing device is configured to control the switching element (SW4, SW6, SW8) such that a temperature detection process of the first load based on the output of the operational amplifier and a temperature detection process of the second load based on the output of the operational amplifier are performed in different periods.