Abstract: A printer eliminating an installation space on a desk or a floor. A printer has a hook and a housing. The hook is provided on the housing and is locked to a display panel to attach the printer to the display panel. The printer can be installed by making use of a space at a rear surface of the display panel, and a printed sheet can be discharged in the same side as the surface of a display. The printer thus provides easy observation of the printed sheet and easy handling.