Refrigerator door having vacuum insulation assembly and method for manufacturing the same

A refrigerator comprising:

• a cabinet;
• a main door rotatably provided on the cabinet;
• and
• a sub door provided on the cabinet and rotatable independently from the main door, the sub door being connected to a storage compartment of the cabinet through the main door when opened, the sub door including:
• a first door body;
• a second door body coupled to the first door body to form a heat insulating space between the first door body and the second door body, the first door body and the second door body defining an exterior of the sub door;
• a vacuum insulation assembly provided inside the heat insulating space, the vacuum insulation assembly having a sealed vacuum chamber;
• and
• a foam filled part provided inside the heat insulating space and surrounding at least a portion of an edge of the vacuum insulation assembly,
• wherein the vacuum insulation assembly includes:
• a coupling part provided along the edge of the vacuum insulation assembly to maintain a vacuum state in the sealed vacuum chamber of the vacuum insulation assembly;
• a first casing facing the first door body;
• and
• a second casing coupled to the first casing to form the sealed vacuum chamber between the first casing and the second casing, the second casing facing the second door body,
• wherein the coupling part is surrounded by the foam filled part while being spaced apart from a peripheral part inside the heat insulating space,
• wherein a gap space is formed between the coupling part and the heat insulating space,
• wherein the coupling part couples an edge of the first casing to an edge of the second casing,
• wherein the second door body includes:
• a first plate defining a side surface of a storage space;
• and
• a second plate connected to the first plate and defining a rear surface of the storage space, the second plate facing the vacuum insulation assembly,
• wherein a first end of the second door body extends from the first plate and is located in a filling space provided with the foam filled part, and
• wherein a first gap space is formed between the coupling part and the first end of the second door body.