The direction in which the media tray 21 moves in and out of the printer and the direction in which the inkjet head 17 moves when printing are on the same line along the front-to-back axis Y of the label printer 5, and the written medium 2B carried on the media tray 21 is positioned on the printing line of the inkjet head 17 when the media tray 21 moves to the tray retraction position 21A. Moving the media tray 21 retracted inside the printer widthwise to the printer from the tray retraction position 21A to the printing position is unnecessary, and printing can start immediately while moving the media tray 21 from the tray retraction position 21A on the widthwise axis X of the printer. The width of the label printer 5 can be reduced because the media tray 21 moves only the diameter of the media widthwise to the printer.