A label printer can reliably print an object in a desired position in the printing area of a recording medium. The label printer has a carriage that moves bi-directionally in a main scanning direction over a disc-shaped recording medium; a printer tray that is disposed movably in a subscanning direction with the recording medium placed thereon; an ink head that is disposed to the carriage and prints a desired object by discharging ink to a printing area on the recording medium in conjunction with movement of the carriage in the main scanning direction and movement of the printer tray in the subscanning direction; a detection unit that is disposed to the carriage and detects a reference position alignment mark that indicates a position used as a reference for appropriately printing the object in the printing area of the recording medium; and a printing position control unit that rotates the recording medium so that the object is printed in the printing area of the recording medium based on the reference position alignment mark detection result from the detection unit.