A refrigerator comprising: a main body having a refrigerating chamber therein; a cold air passage duct (20a; 20b) disposed within the main body, the cold air passage duct (20a; 20b) including a cold air passage to discharge cold air into the refrigerating chamber; a control case (30a; 30b) attached at one surface of the cold air discharge duct (20a; 20b), the control case (30a; 30b) including a cold air discharge opening through which the cold air is discharged; a shutter provided between the cold air passage duct (20a; 20b) and the control case (30a; 30b), the shutter being reciprocally movable in one direction to open and close at least a part of the cold air discharge opening; and a knob link (50a; 50b) rotatably connected to the cold air passage duct (20a; 20b) to press against the shutter such that the shutter is reciprocally movable, wherein the knob link (50a; 50b) comprises: a link body (51a; 51b) having a rotation shaft, the link body (51a; 51b) being connected to the cold air passage duct (20a; 20b) by the rotation shaft to be reciprocally rotatable by a predetermined distance, characterized in that the knob link (50a; 50b) further comprises: a pressing portion provided at a first end portion of the link body (51a; 51b) that is accommodated in a part of the shutter, the pressing portion to press against the shutter to be reciprocally movable in the one direction, and a knob (57a; 57b) formed on a second end portion of the link body (51a; 51b) opposite to the first end portion, whereby at least a portion of the knob (57a; 57b) is externally exposed through the control case (30a; 30b) to be manipulated by a user, wherein the link body (51a; 51b) is at least partly disposed inside the cold air passage duct (20a; 20b), whereby the link body (51a; 51b) extends in a direction that intersects with the one direction that the shutter reciprocally moves. a main body having a refrigerating chamber therein; a cold air passage duct (20a; 20b) disposed within the main body, the cold air passage duct (20a; 20b) including a cold air passage to discharge cold air into the refrigerating chamber; a control case (30a; 30b) attached at one surface of the cold air discharge duct (20a; 20b), the control case (30a; 30b) including a cold air discharge opening through which the cold air is discharged; a shutter provided between the cold air passage duct (20a; 20b) and the control case (30a; 30b), the shutter being reciprocally movable in one direction to open and close at least a part of the cold air discharge opening; and a knob link (50a; 50b) rotatably connected to the cold air passage duct (20a; 20b) to press against the shutter such that the shutter is reciprocally movable, wherein the knob link (50a; 50b) comprises: a link body (51a; 51b) having a rotation shaft, the link body (51a; 51b) being connected to the cold air passage duct (20a; 20b) by the rotation shaft to be reciprocally rotatable by a predetermined distance, characterized in that the knob link (50a; 50b) further comprises: a pressing portion provided at a first end portion of the link body (51a; 51b) that is accommodated in a part of the shutter, the pressing portion to press against the shutter to be reciprocally movable in the one direction, and a knob (57a; 57b) formed on a second end portion of the link body (51a; 51b) opposite to the first end portion, whereby at least a portion of the knob (57a; 57b) is externally exposed through the control case (30a; 30b) to be manipulated by a user, wherein the link body (51a; 51b) is at least partly disposed inside the cold air passage duct (20a; 20b), whereby the link body (51a; 51b) extends in a direction that intersects with the one direction that the shutter reciprocally moves. a link body (51a; 51b) having a rotation shaft, the link body (51a; 51b) being connected to the cold air passage duct (20a; 20b) by the rotation shaft to be reciprocally rotatable by a predetermined distance, characterized in that the knob link (50a; 50b) further comprises: a pressing portion provided at a first end portion of the link body (51a; 51b) that is accommodated in a part of the shutter, the pressing portion to press against the shutter to be reciprocally movable in the one direction, and a knob (57a; 57b) formed on a second end portion of the link body (51a; 51b) opposite to the first end portion, whereby at least a portion of the knob (57a; 57b) is externally exposed through the control case (30a; 30b) to be manipulated by a user, wherein the link body (51a; 51b) is at least partly disposed inside the cold air passage duct (20a; 20b), whereby the link body (51a; 51b) extends in a direction that intersects with the one direction that the shutter reciprocally moves. a pressing portion provided at a first end portion of the link body (51a; 51b) that is accommodated in a part of the shutter, the pressing portion to press against the shutter to be reciprocally movable in the one direction, and a knob (57a; 57b) formed on a second end portion of the link body (51a; 51b) opposite to the first end portion, whereby at least a portion of the knob (57a; 57b) is externally exposed through the control case (30a; 30b) to be manipulated by a user, wherein the link body (51a; 51b) is at least partly disposed inside the cold air passage duct (20a; 20b), whereby the link body (51a; 51b) extends in a direction that intersects with the one direction that the shutter reciprocally moves.