Abstract: A device for bending and transferring leaflets into box-shaped casings including a transfer head including elastically openable tapering end portions which cooperate with preforming edges and forming elements rotatably supported in a bending station to bend the side flaps of a leaflet. The transfer head picks up the bent leaflet from the bending station to transfer the bent leaflet into a box-shaped casing. The stop position of the transfer head in the bending station, as well as position of the tapering end portions during bending of the side flaps, can be adjusted depending on the type of paper of which the leaflet is made.