A laser processor (1, 1A, 1B, 1C) comprising: a machining head in which an optical path of a laser beam is to be disposed; and a cartridge insertable in the machining head, wherein the machining head comprises a pressing member configured to press the cartridge, and a stopper surface configured to limit movement of the cartridge pressed by the pressing member to apply a reaction force to the cartridge, and wherein the cartridge comprises an optical component to be disposed on the optical path in a state in which the cartridge is inserted in the machining head, characterized in that the cartridge further comprises a first member configured to come into contact with a first surface of the optical component and the pressing member, and a second member configured to come into contact with a second surface of the optical component and the stopper surface, wherein the first and the second member are not screwed to each other, and $ wherein the first member is configured to be pressed by the pressing member and to press the first surface of the optical component, and wherein the second member is configured to receive the reaction force from the stopper surface and to press the second surface of the optical component. a machining head in which an optical path of a laser beam is to be disposed; and a cartridge insertable in the machining head, wherein the machining head comprises a pressing member configured to press the cartridge, and a stopper surface configured to limit movement of the cartridge pressed by the pressing member to apply a reaction force to the cartridge, and a pressing member configured to press the cartridge, and a stopper surface configured to limit movement of the cartridge pressed by the pressing member to apply a reaction force to the cartridge, and wherein the cartridge comprises an optical component to be disposed on the optical path in a state in which the cartridge is inserted in the machining head, characterized in that the cartridge further comprises a first member configured to come into contact with a first surface of the optical component and the pressing member, and a second member configured to come into contact with a second surface of the optical component and the stopper surface, an optical component to be disposed on the optical path in a state in which the cartridge is inserted in the machining head, characterized in that the cartridge further comprises a first member configured to come into contact with a first surface of the optical component and the pressing member, and a second member configured to come into contact with a second surface of the optical component and the stopper surface, wherein the first and the second member are not screwed to each other, and $ wherein the first member is configured to be pressed by the pressing member and to press the first surface of the optical component, and wherein the second member is configured to receive the reaction force from the stopper surface and to press the second surface of the optical component. wherein the first member is configured to be pressed by the pressing member and to press the first surface of the optical component, and wherein the second member is configured to receive the reaction force from the stopper surface and to press the second surface of the optical component.