A printer includes a printer body including a holder configured to house rolled recording paper, a cover configured to open and close the holder, a coupling mechanism that couples the cover to the printer body, and a detachment preventing mechanism configured to prevent the cover from being detached from the printer body. The coupling mechanism includes shafts formed on one of side plates of the cover and inner walls of the printer body, and shaft holes formed in another one of the side plates and the inner walls and configured to receive the shafts; and the detachment preventing mechanism includes a stopper that is disposed such that ends of the stopper contact inner surfaces of the side plates and configured to support the side plates and prevent the side plates from falling when a load is applied to the cover.