A printer for a print sheet provided with a printer main body having a print sheet supplying shaft device for holding in a roll, at a sheet supplying unit, a strip-form print sheet for printing a predefined information at a sheet printing unit, and capable of feeding the print sheet in a strip-form to a transfer route headed toward the sheet printing unit, the print sheet supplying shaft device comprising: a roll holding member for holding the print sheet in a roll and protruding a roll supplying shaft respectively at a pair of right-and-left outer surfaces at the sheet supplying unit; a pair of right and left shaft clamping members capable of clamping the roll supplying shaft in an attachable arid detachable manner; a pair of urging members, each urging member urging one of the pair of shaft clamping members towards the roll supplying shaft and being capable of providing load by frictional force to the roll supplying shaft resisting the feeding movement of the print sheet; wherein the pair of right and left shaft clamping members is provided along the attaching and detaching direction of the print sheet to and from the sheet supplying unit; wherein each of the pair of right and left shaft clamping members is provided with a supplying shaft holding recess capable of clamping the roll supplying shaft rotatably; wherein each of the pair of right and left shaft clamping members is provided with a fixed damping piece contacting the roll supplying shaft and supporting it; and a movable clamping piece clamping the roll supplying shaft between the movable clamping piece and the fixed clamping piece and openable and closable to the fixed clamping piece, and wherein an openable cover is connected to the printer main body at an opening and closing shaft on one end portion, and by opening the openable cover from the printer main body, enabling to form an loading opening between the openable cover and the printer main body, and providing the pair of right and left shaft clamping members along the attaching and detaching direction from the loading opening to the sheet supplying unit of the rolled print sheet. a roll holding member for holding the print sheet in a roll and protruding a roll supplying shaft respectively at a pair of right-and-left outer surfaces at the sheet supplying unit; a pair of right and left shaft clamping members capable of clamping the roll supplying shaft in an attachable arid detachable manner; a pair of urging members, each urging member urging one of the pair of shaft clamping members towards the roll supplying shaft and being capable of providing load by frictional force to the roll supplying shaft resisting the feeding movement of the print sheet; wherein the pair of right and left shaft clamping members is provided along the attaching and detaching direction of the print sheet to and from the sheet supplying unit; wherein each of the pair of right and left shaft clamping members is provided with a supplying shaft holding recess capable of clamping the roll supplying shaft rotatably; wherein each of the pair of right and left shaft clamping members is provided with a fixed damping piece contacting the roll supplying shaft and supporting it; and a movable clamping piece clamping the roll supplying shaft between the movable clamping piece and the fixed clamping piece and openable and closable to the fixed clamping piece, and wherein an openable cover is connected to the printer main body at an opening and closing shaft on one end portion, and by opening the openable cover from the printer main body, enabling to form an loading opening between the openable cover and the printer main body, and providing the pair of right and left shaft clamping members along the attaching and detaching direction from the loading opening to the sheet supplying unit of the rolled print sheet.