A method of manufacturing a vapor deposition mask device, the vapor deposition mask device including a vapor deposition mask that has a first surface, a second surface opposite to the first surface, and a plurality of through-holes extending from the first surface to the second surface, and a frame having a third surface and a fourth surface opposite to the third surface, the vapor deposition mask has a pair of ear parts constituting a pair of end portions in a longitudinal direction of the vapor deposition mask, and an intermediate part located between the pair of ear parts, each of the pair of ear parts includes a weld section welded to the third surface of the frame, and an extension section located between the weld section and the end portion of the vapor deposition mask, the method of manufacturing a vapor deposition mask device comprising: a step of preparing the vapor deposition mask; a step of applying tension to the vapor deposition mask, in a state in which at least part of the second surface makes contact with the third surface, and at least part of the second surface of a part of the vapor deposition mask, which does not overlap with the frame as viewed from a normal direction of the first surface, is located toward the fourth surface rather than the third surface; and being characterised by: a step of welding the vapor deposition mask to the frame, in the step of welding the vapor deposition mask to the frame, laser light is applied from the first surface, a joint, which is a part of the vapor deposition mask and the frame are joined to each other, is formed at the weld section, the joint includes a weld mark, the weld mark is formed such as to be hollowed to the second surface side as compared to the first surface. the vapor deposition mask device including a vapor deposition mask that has a first surface, a second surface opposite to the first surface, and a plurality of through-holes extending from the first surface to the second surface, and a frame having a third surface and a fourth surface opposite to the third surface, a vapor deposition mask that has a first surface, a second surface opposite to the first surface, and a plurality of through-holes extending from the first surface to the second surface, and a frame having a third surface and a fourth surface opposite to the third surface, the vapor deposition mask has a pair of ear parts constituting a pair of end portions in a longitudinal direction of the vapor deposition mask, and an intermediate part located between the pair of ear parts, each of the pair of ear parts includes a weld section welded to the third surface of the frame, and an extension section located between the weld section and the end portion of the vapor deposition mask, the method of manufacturing a vapor deposition mask device comprising: a step of preparing the vapor deposition mask; a step of applying tension to the vapor deposition mask, in a state in which at least part of the second surface makes contact with the third surface, and at least part of the second surface of a part of the vapor deposition mask, which does not overlap with the frame as viewed from a normal direction of the first surface, is located toward the fourth surface rather than the third surface; and being characterised by: a step of welding the vapor deposition mask to the frame, in the step of welding the vapor deposition mask to the frame, laser light is applied from the first surface, a joint, which is a part of the vapor deposition mask and the frame are joined to each other, is formed at the weld section, the joint includes a weld mark, the weld mark is formed such as to be hollowed to the second surface side as compared to the first surface. a step of preparing the vapor deposition mask; a step of applying tension to the vapor deposition mask, in a state in which at least part of the second surface makes contact with the third surface, and at least part of the second surface of a part of the vapor deposition mask, which does not overlap with the frame as viewed from a normal direction of the first surface, is located toward the fourth surface rather than the third surface; and being characterised by: a step of welding the vapor deposition mask to the frame, in the step of welding the vapor deposition mask to the frame, laser light is applied from the first surface, a joint, which is a part of the vapor deposition mask and the frame are joined to each other, is formed at the weld section, the joint includes a weld mark, the weld mark is formed such as to be hollowed to the second surface side as compared to the first surface. a step of welding the vapor deposition mask to the frame, in the step of welding the vapor deposition mask to the frame, laser light is applied from the first surface, a joint, which is a part of the vapor deposition mask and the frame are joined to each other, is formed at the weld section, the joint includes a weld mark, the weld mark is formed such as to be hollowed to the second surface side as compared to the first surface.