Label printer and printing medium

摘要

In a label printer, a top cover made of transparent resin is attached to a housing at a rear upper edge to cover a roll sheet holder storage part and to be freely opened and closed. A roll sheet of a roll sheet holder removably mounted in the roll sheet holder storage part is visible through the transparent resinous top cover. The roll sheet is provided with a plurality of medium information marks by printing. The medium information marks are visible through the top cover.