A power supply unit for an aerosol inhaler having a power supply capable of performing discharge to a load, which heats an aerosol generation source and whose temperature and electric resistance value (R H) have a correlation, the power supply unit for the aerosol inhaler comprising: a first element connected in series to the load and having a first electric resistance value; a second series circuit including a second element having a second electric resistance value and a third element connected in series to the second element and having a third electric resistance value, and connected in parallel with a first series circuit including the load and the first element; and an operational amplifier in which a non-inverting input terminal (+)is connected to the first series circuit, and the inverting input terminal (-) is connected to the second series circuit, wherein each of the first electric resistance value, the second electric resistance value and the third electric resistance value is larger than the electric resistance value (R H) of the load at a temperature at which the aerosol is generated from the aerosol generation source or at a temperature that is reached only when the aerosol generation source is exhausted, wherein a condition that a first resistance ratio (m) is larger than a second resistance ratio (n) is satisfied when the load is at the temperature at which the aerosol is generated from the aerosol generation source or when the load is at the temperature that is reached only when the aerosol generation source is exhausted, the first resistance ratio (m) is a value obtained by dividing the second electric resistance value of the second element serving as a high potential side element in the second series circuit by the third electric resistance value of the third element serving as a low potential side element in the second series circuit, and the second resistance ratio (n) is a value obtained by dividing the first electric resistance value of the first element serving as a high potential side element in the first series circuit by an electric resistance value (R H) of the load serving as a low potential side element in the first series circuit. a first element connected in series to the load and having a first electric resistance value; a second series circuit including a second element having a second electric resistance value and a third element connected in series to the second element and having a third electric resistance value, and connected in parallel with a first series circuit including the load and the first element; and an operational amplifier in which a non-inverting input terminal (+)is connected to the first series circuit, and the inverting input terminal (-) is connected to the second series circuit, wherein each of the first electric resistance value, the second electric resistance value and the third electric resistance value is larger than the electric resistance value (R H) of the load at a temperature at which the aerosol is generated from the aerosol generation source or at a temperature that is reached only when the aerosol generation source is exhausted, wherein a condition that a first resistance ratio (m) is larger than a second resistance ratio (n) is satisfied when the load is at the temperature at which the aerosol is generated from the aerosol generation source or when the load is at the temperature that is reached only when the aerosol generation source is exhausted, the first resistance ratio (m) is a value obtained by dividing the second electric resistance value of the second element serving as a high potential side element in the second series circuit by the third electric resistance value of the third element serving as a low potential side element in the second series circuit, and the second resistance ratio (n) is a value obtained by dividing the first electric resistance value of the first element serving as a high potential side element in the first series circuit by an electric resistance value (R H) of the load serving as a low potential side element in the first series circuit.