A refrigerator comprising: a cabinet; a storage compartment provided in the cabinet to form a single space in which a storage item is stored; a single door for opening or closing the space formed by the storage compartment; a first cold air supply duct and a second cold air supply duct provided respectively on left and right sides of the storage compartment, the first cold air supply duct and the second cold air supply duct supplying different amounts of cold air; and a storage unit for being pushed into or pulled from the storage compartment in a front-and-rear direction along with the door, the storage unit includes: a first storage unit provided on the left side; a second storage unit provided on the right side; an insulator located between the first storage unit and the second storage unit for separating the first storage unit and the second storage unit from each other; a first cover for opening or closing an opening formed in an upper side of the first storage unit; and a second cover for opening or closing an opening formed in an upper side of the second storage unit, the second cover being movable separately from the first cover, wherein the first cold air supply duct includes an outlet port through which cold air is discharged toward the first storage unit, and the second cold air supply duct includes an outlet port through which cold air is discharged toward the second storage unit, and wherein the first storage unit and the second storage unit are maintained at different temperatures. a cabinet; a storage compartment provided in the cabinet to form a single space in which a storage item is stored; a single door for opening or closing the space formed by the storage compartment; a first cold air supply duct and a second cold air supply duct provided respectively on left and right sides of the storage compartment, the first cold air supply duct and the second cold air supply duct supplying different amounts of cold air; and a storage unit for being pushed into or pulled from the storage compartment in a front-and-rear direction along with the door, the storage unit includes: a first storage unit provided on the left side; a second storage unit provided on the right side; an insulator located between the first storage unit and the second storage unit for separating the first storage unit and the second storage unit from each other; a first cover for opening or closing an opening formed in an upper side of the first storage unit; and a second cover for opening or closing an opening formed in an upper side of the second storage unit, the second cover being movable separately from the first cover, a first storage unit provided on the left side; a second storage unit provided on the right side; an insulator located between the first storage unit and the second storage unit for separating the first storage unit and the second storage unit from each other; a first cover for opening or closing an opening formed in an upper side of the first storage unit; and a second cover for opening or closing an opening formed in an upper side of the second storage unit, the second cover being movable separately from the first cover, wherein the first cold air supply duct includes an outlet port through which cold air is discharged toward the first storage unit, and the second cold air supply duct includes an outlet port through which cold air is discharged toward the second storage unit, and wherein the first storage unit and the second storage unit are maintained at different temperatures.