A regenerative expansion apparatus includes a regenerative tube configured to regenerate cryogenic cooling at the time of expansion of a coolant gas; a cylinder in communication with a low temperature end of the regenerative tube, the cylinder being configured to generate the cryogenic cooling by repeating compression and expansion of the coolant gas via the regenerative tube; a magnetic cold storage material filling inside the regenerative tube, the magnetic cold storage material being made of a magnetic material, the magnetic cold storage material being configured to come in contact with the coolant gas so that the cryogenic cooling is regenerated; and a magnetic shield member surrounding the magnetic cold storage material; wherein the magnetic shield member has an electric resistivity equal to or less than 50 .mu..OMEGA.cm at a normal temperature.