A refrigerator may allow the inner space of a storage box to be sealed by a gasket disposed between the shelf and the storage box and adjust humidity of the sealed inner space of the storage box by disposing a moisture-permeable membrane on the shelf. The refrigerator includes a body, a storage compartment arranged in the body, a shelf arranged in the storage compartment and provided with an extension portion, a storage box coupled to a lower portion of the shelf, the storage box being provided with an edge portion, a plurality of rails provided at sidewalls of the storage compartment to guide the storage box, the rails being provided with an inclined portion, a gasket coupled to the extension portion of the shelf to seal an inner space of the storage box, and a moisture-permeable membrane arrange at the shelf.