A refrigerator comprising: an outer cabinet ; an inner cabinet provided inside the outer cabinet and including a refrigerator compartment formed therein; and a dairy product maker provided inside the refrigerator compartment to produce a dairy product, wherein the dairy product maker comprises: a case comprising a suction port and a discharge port to allow cool air to flow in and out, respectively; a container to store the produced dairy product therein, and to be inserted into or withdrawn from the case ; a heater to apply heat to the container to produce the dairy product in the container ; a plurality of ribs forming a cooling flow channel within the case when the container is accommodated in the case , provided between the suction port and the discharge port to cool the container and including a first rib provided at a first inner surface of the case , a second rib provided at a second inner surface opposite to the first inner surface of the case to be higher than the first rib , and a third rib provided at a third inner surface connected to the first inner surface and second inner surface of the case ; and characterized by a guide slit provided between the first rib and the third rib to guide the produced dairy product, overflowing into the cooling flow channel from the container , to a bottom surface of the case . an outer cabinet ; an inner cabinet provided inside the outer cabinet and including a refrigerator compartment formed therein; and a dairy product maker provided inside the refrigerator compartment to produce a dairy product, wherein the dairy product maker comprises: a case comprising a suction port and a discharge port to allow cool air to flow in and out, respectively; a container to store the produced dairy product therein, and to be inserted into or withdrawn from the case ; a heater to apply heat to the container to produce the dairy product in the container ; a plurality of ribs forming a cooling flow channel within the case when the container is accommodated in the case , provided between the suction port and the discharge port to cool the container and including a first rib provided at a first inner surface of the case , a second rib provided at a second inner surface opposite to the first inner surface of the case to be higher than the first rib , and a third rib provided at a third inner surface connected to the first inner surface and second inner surface of the case ; and characterized by a guide slit provided between the first rib and the third rib to guide the produced dairy product, overflowing into the cooling flow channel from the container , to a bottom surface of the case . a case comprising a suction port and a discharge port to allow cool air to flow in and out, respectively; a container to store the produced dairy product therein, and to be inserted into or withdrawn from the case ; a heater to apply heat to the container to produce the dairy product in the container ; a plurality of ribs forming a cooling flow channel within the case when the container is accommodated in the case , provided between the suction port and the discharge port to cool the container and including a first rib provided at a first inner surface of the case , a second rib provided at a second inner surface opposite to the first inner surface of the case to be higher than the first rib , and a third rib provided at a third inner surface connected to the first inner surface and second inner surface of the case ; and characterized by a guide slit provided between the first rib and the third rib to guide the produced dairy product, overflowing into the cooling flow channel from the container , to a bottom surface of the case . <EOS>