A refrigerator comprising: a cabinet defining a refrigerating compartment and a freezing compartment, a freezing compartment door opening or closing the freezing compartment, and an ice making device disposed on a rear surface of the freezing compartment door, wherein the ice making device comprises; a case disposed on the freezing compartment door; an ice tray rotatably disposed inside the case, the ice tray being configured for making an ice therein; a knob exposed to an outside of the case, the knob being connected to a rotation shaft of the ice tray and rotated by being manipulated from the outside; and an elastic member disposed on the rotation shaft of the ice tray, the elastic member providing an elastic force into the ice tray so that the ice tray is rotated to an original position; wherein the knob comprises: a manipulation part disposed outside the case, the manipulation part being configured to be rotated by a user; and a rotation plate being disposed inside the case, wherein a portion of the rotation plate passes through the case and is coupled to the manipulation part to be thereby rotated together with the manipulation part; characterized in that the knob further comprises a second guide part, wherein a tray connection part is disposed on the rotation shaft of the ice tray and is coupled to the second guide part when the ice tray is mounted. a cabinet defining a refrigerating compartment and a freezing compartment, a freezing compartment door opening or closing the freezing compartment, and an ice making device disposed on a rear surface of the freezing compartment door, wherein the ice making device comprises; a case disposed on the freezing compartment door; an ice tray rotatably disposed inside the case, the ice tray being configured for making an ice therein; a knob exposed to an outside of the case, the knob being connected to a rotation shaft of the ice tray and rotated by being manipulated from the outside; and an elastic member disposed on the rotation shaft of the ice tray, the elastic member providing an elastic force into the ice tray so that the ice tray is rotated to an original position; wherein the knob comprises: a manipulation part disposed outside the case, the manipulation part being configured to be rotated by a user; and a rotation plate being disposed inside the case, wherein a portion of the rotation plate passes through the case and is coupled to the manipulation part to be thereby rotated together with the manipulation part; characterized in that the knob further comprises a second guide part, wherein a tray connection part is disposed on the rotation shaft of the ice tray and is coupled to the second guide part when the ice tray is mounted. a manipulation part disposed outside the case, the manipulation part being configured to be rotated by a user; and a rotation plate being disposed inside the case, wherein a portion of the rotation plate passes through the case and is coupled to the manipulation part to be thereby rotated together with the manipulation part; characterized in that the knob further comprises a second guide part, wherein a tray connection part is disposed on the rotation shaft of the ice tray and is coupled to the second guide part when the ice tray is mounted.