A printer includes, a casing, a cover provided swingably, the cover covering an opening portion of the casing, a printing portion configured to print on a print medium, a ribbon supply shaft configured to hold an ink ribbon to be supplied to the printing portion, and a printing unit provided swingably, in a state where the printing unit is accommodated in the cover, rotation of the ribbon supply shaft is permitted, and when the open end side of the printing unit is separated from the cover and the ribbon supply shaft is placed at a ribbon replacement position where the ink ribbon is attachable and detachable, the rotation of the ribbon supply shaft is regulated.