Refrigerant charging method for refrigeration device having carbon dioxide as refrigerant

A refrigerant charging method, comprising:

• installing on site a refrigeration device having an indoor unit and an outdoor unit and having carbon dioxide used as a refrigerant, the indoor unit and the outdoor unit being connected using interconnecting piping, and the refrigerant being subsequently charged on-site into the refrigeration device;
• cooling a container to 31° C. or below using a cooling medium, the container containing the refrigerant and supplying the refrigerant to a space in the refrigeration device intended to be charged by the refrigerant;
• confirming that the container has reached 31° C. or below;
• and
• moving the refrigerant to the intended charging space from the container upon confirming that the container has reached 31° C. or below via the cooling step,
• when moving the refrigerant from the container to the intended charging space, first, refrigerant that is in a gas phase within the container is moved into the intended charging space, whereupon refrigerant that is in a liquid phase within the container is moved into the intended charging space.