To obtain a resistance measuring capable of shortening the measurement time and attaining high accuracy in the case of measuring a low resistance value containing inductance like a current conductor of switches for electric power and reducing the size of the apparatus and the power consumption.

In the resistance measuring apparatus provided with a power source circuit for sending current to an object to be measured 100 including an inductance L2 part from between two terminals, a voltage measuring circuit for measuring the voltage between the two terminals of the object to be measured, a current measuring circuit for measuring current flowing in the object to be measured and a resistance calculation circuit for calculating the resistance value by dividing the voltage value measured with the voltage measuring circuit by the current value measured with the current measuring circuit, the power source circuit makes a current (i) of a waveform including a point where the current variation with time becomes 0, flow to the object to be measured 100, and the resistance calculation circuit calculates a resistance value R2 of the object to be measured 100, from the voltage and the current at the timing when the current variation becomes 0.