PURPOSE: To defrost without reversing a refrigerating cycle by moving a header in which one of a capillary tube group formed by disposing a plurality of capillary tubes in parallel is connected, and applying a vibration to the tube to shake off frost adhered to a surface of the tube.

CONSTITUTION: A metal capillary tube 1 is spirally formed. A plurality of the tubes 1 are disposed in parallel to form a capillary tube group 2, one end of which is connected to a stationary header 3 and the other end of which is connected to a movable header 4 provided vertically movably. The header 4 is formed of a magnetic material, and two electromagnets 5 each for sucking to move the header 4 above the header 4 are provided fixedly on the right and left sides.