To reduce the error, caused by the shunt current Ig shunt to a DC source substantially, to zero in the measurement for obtaining the inductance of a sample from the terminal voltage ex and the current Is, by making the correct measurement current Is flow from the inductance meter 1 to the sample reactor Lx connected with the DC source 3.

The shunt circuit 2, connected to the sample reactor and the constant current source 3 for DC superposing, is serially connected to the mutual inductor M and the injection transformer T which will not be saturated by the DC current, and at the same time, the shunt current is canceled by negative feed back of the converted voltage of the mutual inductor M by amplifying it by the amplifier A to the primary winding of the injection transformer T.