Plate assembly and home appliance

A refrigerator comprising:

• a storage compartment;
• an evaporator configured to generate cold air;
• and
• a cold air duct configured to guide the cold air generated in the evaporator to the storage compartment, the cold air duct including:
• a front plate facing the storage compartment, the front plate including:
• a front body, and
• a first coupling portion on a rear surface of the front body,
• a rear plate detachably coupled to a rear of the front plate, the rear plate including:
• a rear body,
• a second coupling portion including:
• an opening in the rear body, and
• a locking portion, and
• a slit in the rear body configured so that the second coupling portion is elastically deformable, and
• a heat insulating member disposed between the front plate and the rear plate,
• wherein
• the first coupling portion is coupled to the second coupling portion as a portion of the first coupling portion is inserted into the opening in the rear body, and the locking portion protrudes toward and contacts the portion of the first coupling portion inserted into the opening in the rear body, and
• the first coupling portion and the second coupling portion are configured so that the first coupling portion and the second coupling portion are decouplable by an external force pressing on the first coupling portion.