A printer includes a box-like main body cover, an upper cover, a stacker, and stacker attaching means. The main body cover has an opening and stores a printing unit main body. The upper cover is attached to be able to open/close the opening of the main body cover and pivots about a rear end side of the main body cover as an axis. The stacker is attached to a rear end portion of the upper cover to temporarily place a paper sheet thereon. The stacker attaching means supports the stacker to be pivotal in a direction opposite to a pivoting direction of the upper cover.