A refrigerator including: an inner case forming a storage compartment with an open front side and comprising a plurality of plates formed by injection molding; an outer case coupled to an outside of the inner case; and an insulation material between the inner case and the outer case. The plurality of plates includes an upper plate and a plurality of lateral plates coupled to the upper plate. The upper plate includes an upper plate body and an upper plate coupler. The each of the plurality of lateral plates includes a lateral plate body and a lateral plate coupler. The upper plate coupler includes an upward extension portion extending upward from the upper plate body and spaced from the lateral plate body. The inner case includes a groove recessed upward extending in a front and rear direction between the upward extension portion and the lateral plate body.