A printer comprising: a printer main body; a print paper sheet feeding unit for feeding a label continuous body as a print paper sheet; a printing unit configured to perform printing on the print paper sheet; an operation unit configured to operate the printer; a display unit; and a control unit configured to display contents of various maintenance operations of the printer on the display unit and configured to enable selecting any one of maintenance operations, wherein the operation unit comprises a guide command button configured to command a maintenance guide for a maintenance work of performing the selected maintenance operation; characterized in that the printing unit having a thermal head and a platen roller; and the control unit displays previously prepared photographed video images on the display unit by the operation of the guide command button, the photographed video images are a whole process of the maintenance guide from start to end at once, including at least a step of holding a new label continuous body on the print paper sheet feeding unit and inserting the new label continuous body from the print paper sheet feeding unit to between the thermal head and the platen roller and inserting moreover to a label issuance opening, and a step of rotating and closing the thermal head with respect to the platen roller, the whole process is photographed video images with an arrow (3B, 3C, 3D, 18A, 18B) for supplementary explanation, the explanation including the inserting the new label continuous body from the print paper sheet feeding unit to between the thermal head and the platen roller. a printer main body; a print paper sheet feeding unit for feeding a label continuous body as a print paper sheet; a printing unit configured to perform printing on the print paper sheet; an operation unit configured to operate the printer; a display unit; and a control unit configured to display contents of various maintenance operations of the printer on the display unit and configured to enable selecting any one of maintenance operations, wherein the operation unit comprises a guide command button configured to command a maintenance guide for a maintenance work of performing the selected maintenance operation; characterized in that the printing unit having a thermal head and a platen roller; and the control unit displays previously prepared photographed video images on the display unit by the operation of the guide command button, the photographed video images are a whole process of the maintenance guide from start to end at once, including at least a step of holding a new label continuous body on the print paper sheet feeding unit and inserting the new label continuous body from the print paper sheet feeding unit to between the thermal head and the platen roller and inserting moreover to a label issuance opening, and a step of rotating and closing the thermal head with respect to the platen roller, the whole process is photographed video images with an arrow (3B, 3C, 3D, 18A, 18B) for supplementary explanation, the explanation including the inserting the new label continuous body from the print paper sheet feeding unit to between the thermal head and the platen roller.