To prevent a liquid refrigerant from returning to the discharge side of a compressor.

An evaporation tray pipe 22 drawn out of the discharge side of the compressor 11 is arranged on a lower face of an evaporation tray 20 receiving and storing defrosting water in a close adhesion manner, and gas refrigerant having high temperature flows and is heated in the evaporation tray pipe 22 when performing cooling operation to evaporate and discharge defrosting water. A rising part 25 is formed on the halfway of a discharge pipe 17 extending from a discharge port 11A of the compressor 11 to the evaporation tray 20, and its top 25A is at a position higher than a spiral condenser 12 and a cooler 15. In a defrosting process, even when liquid refrigerant is collected due to abrupt cooling of the evaporation tray pipe 22 by defrosting water and all the refrigerants become liquid refrigerant and overflow from the evaporation tray pipe 22, liquid refrigerant is collected in the rising part 25, the spiral condenser 12, and the cooler 15 to surely prevent liquid refrigerant from returning to the discharge port 11A side of the compressor 11.