A refrigerator comprising: a cabinet suitable to be installed to pass through or inserted into a door or a wall and forming a storage compartment for storing goods; a housing coupled to or formed integrally with a part of the cabinet ; an outdoor side door configured to open or close a front side of the storage compartment and exposed to an outside of a space, the door or the wall being a boundary of the space; an indoor side door configured to open or close a rear side of the storage compartment and exposed to an inside of the space; and a cold air supply device, at least a part of which is disposed in the housing , configured to make air in the storage compartment cold, characterized in that the refrigerator further comprises an outer gasket surrounding a rear edge of the outdoor side door ; wherein the cabinet comprises a contact shoulder which is protruded inward from an inner circumferential surface of the cabinet , and disposed spaced apart rearward from a front end of the cabinet by a predetermined distance, wherein when the outdoor side door is closed, the outer gasket is configured to come in contact with a front surface of the contact shoulder , wherein a guide hole is formed on a portion of the cabinet between the front surface of the contact shoulder and the front end of the cabinet , and wherein a guide flow passage connecting an inner space of the housing and the guide hole is formed in the cabinet , so that a portion of inside air whose temperature has been increased by heat exchange with a heat sink of the cold air supply device rises along the outer gasket located at the rear side of the outside side door . a cabinet suitable to be installed to pass through or inserted into a door or a wall and forming a storage compartment for storing goods; a housing coupled to or formed integrally with a part of the cabinet ; an outdoor side door configured to open or close a front side of the storage compartment and exposed to an outside of a space, the door or the wall being a boundary of the space; an indoor side door configured to open or close a rear side of the storage compartment and exposed to an inside of the space; and a cold air supply device, at least a part of which is disposed in the housing , configured to make air in the storage compartment cold, characterized in that the refrigerator further comprises an outer gasket surrounding a rear edge of the outdoor side door ; wherein the cabinet comprises a contact shoulder which is protruded inward from an inner circumferential surface of the cabinet , and disposed spaced apart rearward from a front end of the cabinet by a predetermined distance, wherein when the outdoor side door is closed, the outer gasket is configured to come in contact with a front surface of the contact shoulder , wherein a guide hole is formed on a portion of the cabinet between the front surface of the contact shoulder and the front end of the cabinet , and wherein a guide flow passage connecting an inner space of the housing and the guide hole is formed in the cabinet , so that a portion of inside air whose temperature has been increased by heat exchange with a heat sink of the cold air supply device rises along the outer gasket located at the rear side of the outside side door . <EOS>