A refrigerator, comprising: a body defining a storage compartment; a first receiving box installed in the storage compartment underneath a shelf, the first receiving box being configured to be pulled out from and pushed into the storage compartment and including an open top and at least one sidewall having an upwardly-inclined slope and a downwardly-inclined slope with respect to a front of the first receiving box, the upwardly-inclined slope being provided in front of the downwardly-inclined slope; a second receiving box configured to be pulled out above the first receiving box when the first receiving box is pulled out; and a cover with a front end being a free end and a rear end being hingedly coupled to the shelf, the cover being installed to come into contact with and cover the first receiving box and adapted to be pivotally rotated as the first receiving box is pulled out or pushed in, wherein the cover is pivotally rotated upward by the movement of the cover on the upwardly-inclined slope to provide an open space between the cover and the first receiving box when the first receiving box is pulled out, wherein the cover is pivotally rotated downward by the movement of the cover on the downwardly-inclined slope when the first receiving box is pulled out, the cover not interfering with a pull-out path of the second receiving box, so to permit the second receiving box to be pulled out in a state in which the first receiving box is pulled out, and wherein a part of the open top of the first receiving box is closed by the shelf, and a remaining part of the open top of the first receiving box is closed by the cover when the first receiving box is pushed into the storage compartment. a body defining a storage compartment; a first receiving box installed in the storage compartment underneath a shelf, the first receiving box being configured to be pulled out from and pushed into the storage compartment and including an open top and at least one sidewall having an upwardly-inclined slope and a downwardly-inclined slope with respect to a front of the first receiving box, the upwardly-inclined slope being provided in front of the downwardly-inclined slope; a second receiving box configured to be pulled out above the first receiving box when the first receiving box is pulled out; and a cover with a front end being a free end and a rear end being hingedly coupled to the shelf, the cover being installed to come into contact with and cover the first receiving box and adapted to be pivotally rotated as the first receiving box is pulled out or pushed in, wherein the cover is pivotally rotated upward by the movement of the cover on the upwardly-inclined slope to provide an open space between the cover and the first receiving box when the first receiving box is pulled out, wherein the cover is pivotally rotated downward by the movement of the cover on the downwardly-inclined slope when the first receiving box is pulled out, the cover not interfering with a pull-out path of the second receiving box, so to permit the second receiving box to be pulled out in a state in which the first receiving box is pulled out, and wherein a part of the open top of the first receiving box is closed by the shelf, and a remaining part of the open top of the first receiving box is closed by the cover when the first receiving box is pushed into the storage compartment.