A printing device includes a casing housing a sheet-feed mechanism for transporting a print medium and a carriage transporting mechanism for reciprocally moving a carriage in a main scanning direction. A print unit having a print head is detachably attached to the carriage. The print unit is capable of printing whether attached or detached from the carriage. A detection unit is provided for determining whether the print unit is attached to the carriage. The casing can be formed with a hollow space in which the print unit can be stored when the print device is not being used.
