A printer configured to perform a printing operation on a printing medium, including: a cylindrically shaped housing including a bottom surface and a cylindrical surface on which an outlet is formed, the housing being configured to be placed on a horizontal table in any of a first posture in which the bottom surface is opposed to the table and a second posture in which a specific portion of the cylindrical surface is opposed to the table, the outlet being formed at a position of the cylindrical surface at which the printing medium stored in the housing is dischargeable from the outlet irrespective of whether the housing takes the first posture or the second posture on the table; and a second-posture keeping structure to keep the housing in the second posture in a state in which the cylindrical surface is opposed to the table.