An electric leakage detector comprising: a DC leakage detector; an AC leakage detector configured to detect an AC leakage current; and an OR circuit configured to calculate a logical sum of a first output signal output from the AC leakage detector and a second output signal output from the DC leakage detector, the DC leakage detector comprising: a core configured to allow a plurality of conductors to pass therethrough; an excitation coil wound around the core; a current-detecting resistor configured to convert a current flowing through the excitation coil into a detection voltage (Vd); an excitation unit configured to apply, to the excitation coil, an excitation voltage with a voltage level alternately changing between a high voltage value higher than a reference voltage value (Vr) and a low voltage value lower than the reference voltage value (Vr); and a DC component detection unit configured to output a DC detection signal representing magnitude of a DC component of the detection voltage (Vd), the excitation unit including: a comparison circuit configured to output a comparison signal having a voltage level switching between a high level and a low level depending on whether the detection voltage (Vd) is greater than, or equal to or less than, a threshold voltage (Vth); and a voltage switching circuit configured to switch, according to the voltage level of the comparison signal, the voltage level of the excitation voltage between the high voltage value and the low voltage value. a DC leakage detector; an AC leakage detector configured to detect an AC leakage current; and an OR circuit configured to calculate a logical sum of a first output signal output from the AC leakage detector and a second output signal output from the DC leakage detector, the DC leakage detector comprising: a core configured to allow a plurality of conductors to pass therethrough; an excitation coil wound around the core; a current-detecting resistor configured to convert a current flowing through the excitation coil into a detection voltage (Vd); an excitation unit configured to apply, to the excitation coil, an excitation voltage with a voltage level alternately changing between a high voltage value higher than a reference voltage value (Vr) and a low voltage value lower than the reference voltage value (Vr); and a DC component detection unit configured to output a DC detection signal representing magnitude of a DC component of the detection voltage (Vd), a core configured to allow a plurality of conductors to pass therethrough; an excitation coil wound around the core; a current-detecting resistor configured to convert a current flowing through the excitation coil into a detection voltage (Vd); an excitation unit configured to apply, to the excitation coil, an excitation voltage with a voltage level alternately changing between a high voltage value higher than a reference voltage value (Vr) and a low voltage value lower than the reference voltage value (Vr); and a DC component detection unit configured to output a DC detection signal representing magnitude of a DC component of the detection voltage (Vd), the excitation unit including: a comparison circuit configured to output a comparison signal having a voltage level switching between a high level and a low level depending on whether the detection voltage (Vd) is greater than, or equal to or less than, a threshold voltage (Vth); and a voltage switching circuit configured to switch, according to the voltage level of the comparison signal, the voltage level of the excitation voltage between the high voltage value and the low voltage value. a comparison circuit configured to output a comparison signal having a voltage level switching between a high level and a low level depending on whether the detection voltage (Vd) is greater than, or equal to or less than, a threshold voltage (Vth); and a voltage switching circuit configured to switch, according to the voltage level of the comparison signal, the voltage level of the excitation voltage between the high voltage value and the low voltage value.