A control circuit for an electric leakage circuit breaker, capable of preventing an error in determining an electric leakage generation due to an offset voltage of an input amplifier, including, a zero phase current transformer configured to detect a zero phase current on a circuit as a leakage detection signal, a filter circuit section configured to remove a high frequency noise included in the leakage detection signal, an input amplifier configured to a voltage formed by a current of the leakage detection signal and an impedance of the filter circuit section, and includes a pair of transistors, a base current generator commonly connected to the bases of the pair of transistors and configured to supply the same amount of base current to the pair of transistors, and a trip determination circuit section configured to determine whether to output a trip control signal.