A mold comprising: a core comprising: a core body; and a sliding core on the core body, and separable from the core body in a first direction with respect to the core body; and an ejector to press the sliding core in the first direction to separate a molded product formed in the core from the core, wherein the ejector comprises: a driver positioned below the core and movable up to a lower surface of the core in the first direction; and a first rod movable in the first direction to press the sliding core to be separated from the driver, a coupler configured to couple the first rod with, or separate the first rod from, the driver, and wherein: the first rod is configured to be pressed by a pressing rod; the driver is configured to move in the first direction when the pressing rod presses the first rod in a state in which the first rod is coupled with the driver; and the driver comprises a first hole through which the pressing rod is configured to pass to press the first rod in a state in which the first rod is separated from the driver, so that the first rod is movable further in the first direction than the driver. a core comprising: a core body; and a sliding core on the core body, and separable from the core body in a first direction with respect to the core body; and a core body; and a sliding core on the core body, and separable from the core body in a first direction with respect to the core body; and an ejector to press the sliding core in the first direction to separate a molded product formed in the core from the core, wherein the ejector comprises: a driver positioned below the core and movable up to a lower surface of the core in the first direction; and a first rod movable in the first direction to press the sliding core to be separated from the driver, a coupler configured to couple the first rod with, or separate the first rod from, the driver, and wherein: the first rod is configured to be pressed by a pressing rod; the driver is configured to move in the first direction when the pressing rod presses the first rod in a state in which the first rod is coupled with the driver; and the driver comprises a first hole through which the pressing rod is configured to pass to press the first rod in a state in which the first rod is separated from the driver, so that the first rod is movable further in the first direction than the driver. a driver positioned below the core and movable up to a lower surface of the core in the first direction; and a first rod movable in the first direction to press the sliding core to be separated from the driver, a coupler configured to couple the first rod with, or separate the first rod from, the driver, and wherein: the first rod is configured to be pressed by a pressing rod; the driver is configured to move in the first direction when the pressing rod presses the first rod in a state in which the first rod is coupled with the driver; and the driver comprises a first hole through which the pressing rod is configured to pass to press the first rod in a state in which the first rod is separated from the driver, so that the first rod is movable further in the first direction than the driver. the first rod is configured to be pressed by a pressing rod; the driver is configured to move in the first direction when the pressing rod presses the first rod in a state in which the first rod is coupled with the driver; and the driver comprises a first hole through which the pressing rod is configured to pass to press the first rod in a state in which the first rod is separated from the driver, so that the first rod is movable further in the first direction than the driver.