Door attachment method, and door moving device and sagging measurement device used therefor

A door attachment method for attaching a door having a door panel and a hinge to an opening of an attachment target in a freely openable/closable manner, the door attachment method comprising:

• a primary fastening step of fastening the hinge to a specified attachment surface of the attachment target with a specified magnitude of torque by a fastening mechanism using a fastening member in a state where a door panel holding mechanism holds the door panel to arrange the door at a target position, at which said door panel closes the opening, and the holding mechanism holds the hinge;
• a door panel position measurement step of discontinuing holding of the door panel while the grip mechanism keeps gripping the hinge, so as to bring the door into a cantilevered state and measuring a relative position of the door panel in the opening in a state where the hinge is primarily fastened;
• a loosening step of loosening fastening of the fastening member by the fastening mechanism;
• a door position correction step of moving the door by a door moving device on the basis of a measurement result in the door panel position measurement step, so as to correct a position of the door;
• and
• a secondary fastening step of fastening the hinge again to the attachment surface with the specified magnitude of torque by the fastening mechanism using the fastening member, wherein
• in a series of the primary fastening step, the door panel position measurement step, the loosening step, the door position correction step, and the secondary fastening step, a state where the grip mechanism grips the hinge to cause the hinge to abut the attachment surface is maintained.