Disclosed herein is a refrigerator which has an improved structure to increase insulating properties. The refrigerator includes a body including an inner casing and an outer casing, a storage compartment formed in the inner casing, an insulator provided between the inner casing and the outer casing to insulate the storage compartment, and a frame unit which is disposed between the adjacent insulators to ensure stiffness of the body and includes at least one coupling surface coupled with at least one of the inner casing and the outer casing.