A refrigerator comprising: an inner case, in which at least one storage compartment (21,22) is formed, the inner case having a plurality of sides with at least some of the plurality of sides of the inner case facing at least some portions of the at least one storage compartment (21,22); an outer case coupled to an least one outer surface of the inner case; a foam insulation material blown into a space between the inner case and the outer case; at least one storage container (41,42,43) slidable into and out of the at least one storage compartment (21,22); at least one central rail unit that guides movement of the at least one storage container (41,42,43); and at least one support member disposed in the at least one storage compartment (21,22) to support the at least one central rail unit, wherein the at least one support member is disposed between the at least one central rail unit and the inner case and is coupled to a bottom side of the inner case, the at least one central rail unit is configured to be coupled to and separated from the at least one support member, and is configured to be coupled to the at least one support member as a portion of the at least one central rail unit is slidably inserted into the support member, and the at least one central rail unit has an insertion protrusion to be coupled to the at least one support member, the at least one support member comprises a hook portion constituting an insertion groove into which the insertion protrusion is inserted, and the hook portion is elastically deformed as the insertion protrusion is inserted into the insertion groove and coupling of the at least one central rail unit and the at least one support member is maintained by the elasticity of the hook portion. an inner case, in which at least one storage compartment (21,22) is formed, the inner case having a plurality of sides with at least some of the plurality of sides of the inner case facing at least some portions of the at least one storage compartment (21,22); an outer case coupled to an least one outer surface of the inner case; a foam insulation material blown into a space between the inner case and the outer case; at least one storage container (41,42,43) slidable into and out of the at least one storage compartment (21,22); at least one central rail unit that guides movement of the at least one storage container (41,42,43); and at least one support member disposed in the at least one storage compartment (21,22) to support the at least one central rail unit, wherein the at least one support member is disposed between the at least one central rail unit and the inner case and is coupled to a bottom side of the inner case, the at least one central rail unit is configured to be coupled to and separated from the at least one support member, and is configured to be coupled to the at least one support member as a portion of the at least one central rail unit is slidably inserted into the support member, and the at least one central rail unit has an insertion protrusion to be coupled to the at least one support member, the at least one support member comprises a hook portion constituting an insertion groove into which the insertion protrusion is inserted, and the hook portion is elastically deformed as the insertion protrusion is inserted into the insertion groove and coupling of the at least one central rail unit and the at least one support member is maintained by the elasticity of the hook portion.