PURPOSE: To prevebnt leakage of working liquid from the output shaft part by enclosing the output shaft of a stiling engine in a case and taking-out the revolution force of the output shaft by utilizing rotary magnetism coupling and driving the steam compressor for compression of coolant.

CONSTITUTION: The output shaft 4 which extends fron a crank is positioned in coaxial manner in the cylindrical projection part 3 which protrudes outward from a part of a crank case 2 of a stirling engine 1, and a the first cylindrical permanent magnet 5 is fixed in the periphery of the shaft 4. The circumference of the projection part 3 is enclosed with a cup-shaped closed vessel 6, and a steam compressor 7 is accomodated in said vessel 6, and the steam of the compressed coolant is stored in the vessel 6. The compressor 7 is connected to the motor 14 of a starter 11 through a shaft 15, and the motor 14 is connected to the cup-shaped magnet supporting body 17 having the second permagnent magnet 18 on the inner wall through a magnetic clutch 13. In operation, revolution of the output shaft 4 is transmitted to the compressor 7 through magnetism coupling of the magnets 5 and 18.