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 (113, 123) and a discharge port (115, 125) 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to flow in and out, respectively; a container to store the produced dairy product therein, and to be inserted into or withdrawn from the case; a heater to apply heat to the container to produce the dairy product in the container; a plurality of ribs forming a cooling flow channel within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 (113, 123) and the discharge port (115, 125) 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 (113, 123) and a discharge port (115, 125) 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to flow in and out, respectively; a container to store the produced dairy product therein, and to be inserted into or withdrawn from the case; a heater to apply heat to the container to produce the dairy product in the container; a plurality of ribs forming a cooling flow channel within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 (113, 123) and the discharge port (115, 125) 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 (113, 123) and a discharge port (115, 125) 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 (113, 123) and the discharge port (115, 125) 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.