A refrigerator having improved space utilization includes a main body, a storage room formed inside of the main body, a center frame provided at the center of the storage room to be spaced apart from both side walls of the storage room and having a guide elongated in a front-rear direction of the storage room and a plurality of shelves detachably coupled to the guide so as to be movable along the guide, the plurality of shelves including a first shelf and a second shelf positioned under the first shelf while the second shelf moving along the same guide as the first shelf in an inverted state.