PROBLEM TO BE SOLVED: To provide a coupling device capable of reducing an occupied space and adjusting a gap between display devices, and to provide a display device assembly using the same.SOLUTION: A plurality of fitting bodies 5a, 5b respectively fixed to rear faces of display devices 3a, 3b are turnably coupled around predetermined axis lines L1-L3 by coupling means 7, movable members 9a, 9b that can move are provided on display surfaces 2a, 2b in directions A1, A2 orthogonal to the predetermined axis lines L1-L3 on planes parallel to each other, and the movable members 9a, 9b are turnably coupled around the predetermined axis lines L1-L3 with hinge means 10. This structure allows free setting of a bending angle between the display devices 3a, 3b.
