A magnetically shielded current transformer is provided, which includes a magnetic core module including a core formed in a ring shape by winding plate shape ribbon a plurality of times, a bobbin configured to accommodate the core, and a coil configured to be wound along an outer circumferential surface of the bobbin; a shielding member which is configured to surround an outer circumferential surface and both side surfaces of the magnetic core module, includes through-holes at centers of the both side surfaces, and is formed of iron; and an outer case configured to protect the magnetic core module and the shielding member. Accordingly, a magnetic path is formed by an external magnetic field, which is applied from the outside, via the shielding member and thus the external magnetic field is prevented from being transferred to the magnetic core module, thereby stably blocking influences caused by the external magnetic field.