Abstract: The present invention is to provide an attachment device of a display panel capable of, while solving enclosure of bubbles in an attachment surface at the time of attachment, reliably removing bubbles generated even after attachment, and remarkably lowering a defectiveness ratio of an attachment body to improve productivity of attachment tasks. A vacuum chamber unit 3 is formed by a chamber main body 10 and a chamber lid body 11. A fixed attachment base 12 including a dam jig 13 is provided in an interior of the chamber main body 10, and a movable attachment base 16 is provided in an interior of the chamber lid body 11.