Embodiments described herein are related to a printer including a thermal head, a platen roller, a plurality of biasing members, and an urging force adjustment mechanism. The urging force adjustment mechanism includes a base member, an action member movable in the widthwise direction with respect to the base member and configured to expand or compress the plurality of biasing members, and a plurality of contact members configured to contact the action member and supported by the base member such that contact positions of the contact members on the action member can be varied in the expansion or compression direction of the biasing members, wherein the amount of expansion or compression of the biasing members varies according to the variation of the contact positions.