PROBLEM TO BE SOLVED: To provide an attachment device capable of setting uniformity of thickness, size and softness of an attachment body attached to the surface of an object in excellent ranges, and achieving longevity of a conveyor belt.SOLUTION: An attachment device 1 is for loading an attachment body 3 to be attached to an object 2 onto a wide belt 41, loading the object 2 on the attachment body 3, and attaching the attachment body 3 to the object 2 while transporting the object 2 with the belt 41. There are included: belt deformation means 5 for lifting and vertically disposing width direction side parts of the belt 41 during transportation so as curve and deform the belt 41 in the air in a nearly U-shape with an opened upper side, and bring the object 2 into a state of being wrapped with the attachment body 3 and belt pulse means 7A and 7B for continuously pulsing the curved and deformed belt 41.SELECTED DRAWING: Figure 2COPYRIGHT: (C)2017,JPO&INPIT