A laser processor comprising: a machining head in which an optical path (F) 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 (F) 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 (F) 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 (F) 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 (F) 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 . <EOS>