Abstract: A medium loading apparatus includes supporting units that are attached to both end portions of roll paper, a loading unit that is loaded with the roll paper to which the supporting units are attached, and a rotational force transfer unit that is arranged on the loading unit so as to be opposed to a shaft rotating member constituting the supporting unit in the axial line direction of the roll paper and transfers a rotational force of a motor to the shaft rotating member.

Abstract: A medium loading device includes: a support unit having a shaft member that is attached to each of both end sections of roll paper and a flange member; a loading portion in which the roll paper with the support units attached thereto is loaded; a temporary placement portion on which the roll paper with the support units attached thereto is placed temporarily before being loaded into the loading portion; and a transfer path for transferring the roll paper with the support units attached thereto from the temporary placement portion to the loading portion. The flange member has in a region facing the transfer path a flat surface that is in contact with the transfer path.