A sheet storing device includes a container including a first holding surface configured to hold a first sheet thereon, and a tray positioned at an upper side of the container. The tray includes a second holding surface configured to hold a second sheet thereon. The tray is configured to selectively move between a first position and a second position downstream from the first position in a first direction. The sheet storing device further includes a positioning unit configured to selectively position the tray in one of the first position and the second position, and a linking unit configured to link the tray to the container and to pivot about a particular pivot axis which extends in a second direction perpendicular to the first direction and parallel to the first holding surface of the container. The linking unit pivots to selectively move the tray between the first position and the second position.