Printer and cutter unit of printer

A printer includes a cutter unit attachable to and detachable from a printer main body, the cutter unit including: a cutter unit main body holding a cutter for cutting a printing medium; and a cutter unit cover having a discharge port for discharging the printing medium and supported by an opening and closing shaft so as to be openable and closable with respect to the cutter unit main body. 打印机具备可装卸于打印机主体的切断器单元，上述切断器单元具有：切断器单元主体，保持用于切断打印介质的切刀；和切断器单元罩，具有排出上述打印介质的排出口，并由开闭轴轴支承为可相对于上述切断器单元主体开闭。