Patent ID: 7528602

Claim:
A magnetic shielding apparatus comprising: a magnetic shielding cylinder made of a high-permeability material, having an opening, and disposed so as to surround one axis; a magnetic shielding door made of a high-permeability material, for opening and closing the opening; and electromagnetic connecting members for electromagnetically connecting the magnetic shielding cylinder to the magnetic shielding door with the opening in a closed state due to rotational shifting of the magnetic shielding door in a direction of the one axis, said magnetic shielding apparatus being configured to shield a component of an external magnetic field, in a direction vertical to the one axis, wherein the electromagnetic connecting members have control members that touch the magnetic shielding door at the time of stopping rotational shifting of the magnetic shielding door and that do not touch the magnetic shielding door at a time of the rotational shifting of the magnetic shielding door.