PURPOSE: To prevent deviation of a center of an amplitude of a piston from a central position of a compression cylinder by due to variations in leakage amount of operating media from clearance seals of pistons contained in a sealed vessel of a reciprocating compressor and disposed oppositely.

CONSTITUTION: The reverse Stirling cycle refrigerator comprises communication ports for communicating sections in a sealed vessel of a reciprocating compressor 33 such as communication ports 28 provided in annular platelike yokes 10A, 10B of first and second, linear motors 4A, 4B for dividing the vessel or further communication ports 29A, 29B provided at end faces of cup-shaped movable frames 5A, 5B of the motors 4A, 4B.