Developments of single crystal growth for the magnetic refrigeration have been reviewed.  Magnetic refrigeration in the temperature below 20K  using the Carnot cycle is progressed surprisingly for the purpose to produce a liquid helium or superfluid helium replaced by the gas refrigeration. The magnetic refrigeration is used for the paramagnetic properties of antiferromagnetic materials, e.g., rare-earth garnets and perovskite single crystals. The points of the developments of the magnetic refrigerants are to improve growth conditions and to control physical properties of the single crystals.