A sheet feeding device includes a side face of a device body and a bypass tray. The bypass tray is supported turnably around a fulcrum part in the side face between a close position along the side face and an open position held at a predetermined angle with the side face. The bypass tray includes a locked piece having a locked hole. The side face includes a locking hook engaging with the locked piece when the bypass tray is at the close position. The locking hook includes an elastically deformable arm part, an engaging protrusion part protruded inwardly from a distal end of the arm part in a width direction of a sheet to insert into the locked hole, and a regulating part coming into contact with an opening edge of the locked hole to regulate an insertion amount of the engaging protrusion part to the locked hole.