A power supply unit for an aerosol inhaler, the aerosol inhaler including a power supply configured to discharge electricity to a load which is configured to heat an aerosol generation source and has a correlation between temperature and electric resistance values, the power supply unit comprising: a first element connected in series to the load and having a first electric resistance value (Rl); a second series circuit which includes a second element having a second electric resistance value (R2), and a third element connected in series to the second element and having a third electric resistance value (R3), the second series circuit being connected in parallel with a first series circuit including the load and the first element; a first operational amplifier which includes a non-inversion input terminal (+) connected to one of a first connection node between the load and the first element and a second connection node between the second element and the third element , and an inversion input terminal (-) connected to the other of the first connection node and the second connection node; a potential adjustment circuit connected to the first operational amplifier and configured to prevent a differential input value of the first operational amplifier from being equal to a potential of a negative power supply terminal of the first operational amplifier or a minimum value acquirable by the first operational amplifier , in a state where a first potential of the first connection node or the second connection node which is connected to the non-inversion input terminal is less than a second potential of the first connection node or the second connection node which is connected to the inversion input terminal; and the inversion input terminal (-) of the first operational amplifier is connected to the other of the first connection node and the second connection node via the potential adjustment circuit. a first element connected in series to the load and having a first electric resistance value (Rl); a second series circuit which includes a second element having a second electric resistance value (R2), and a third element connected in series to the second element and having a third electric resistance value (R3), the second series circuit being connected in parallel with a first series circuit including the load and the first element; a first operational amplifier which includes a non-inversion input terminal (+) connected to one of a first connection node between the load and the first element and a second connection node between the second element and the third element , and an inversion input terminal (-) connected to the other of the first connection node and the second connection node; a potential adjustment circuit connected to the first operational amplifier and configured to prevent a differential input value of the first operational amplifier from being equal to a potential of a negative power supply terminal of the first operational amplifier or a minimum value acquirable by the first operational amplifier , in a state where a first potential of the first connection node or the second connection node which is connected to the non-inversion input terminal is less than a second potential of the first connection node or the second connection node which is connected to the inversion input terminal; and the inversion input terminal (-) of the first operational amplifier is connected to the other of the first connection node and the second connection node via the potential adjustment circuit. <EOS>