PURPOSE: To provide a construction of a gas insulated switchgear and a verification testing method for its current measuring circuit permitting the verification test for the current measuring circuit of a current transformer easily and economically without using grounding switchgear.

CONSTITUTION: Current-carrying terminals 21 and 22 are provided on an exterior wall of a metal container 41 at the opposing positions on both the sides of a current transformer 1 in this construction. By doing this, the metal container 41 is used as the primary conductor of the current transformer 1, a testing current is carried from current-carrying terminals 21 and 22 of this metal container 41, a current detected by the current transformer 1 is measured by a current measuring circuit, thereby verifying the presence or absence of anomaly in the current measuring circuit.