A gangway bellows cover-style connecting device for articulated vehicles comprises a plurality of bands (2) made of flexible material, equipped with stiffening frames (3), connected to each other and forming a tunnel (4) which has an upper wall (6) and two lateral walls (7) for connecting two coaches of a vehicle to each other, and a closing panel (9) connected to a lower portion of the bands (2) for forming a lower wall of the tunnel (4). The connecting device comprises connecting means (10) acting on ends of respective free edges (13, 16) of the closing panel (9) and of the lateral walls (7) of the tunnel (4), in such a way that the closing panel (9) lies coplanar with the free edges (16) of the lateral walls (7) of the tunnel (4).