A thermal printer including a first chassis, a second chassis, a cutting mechanism and a thermal printing mechanism. The first chassis has a movable blade of the cutting mechanism, a print head of the thermal printing mechanism, and an automatic activation mechanism for moving the movable blade from a platen roller of the thermal printing mechanism. A fixed blade of the cutting mechanism and the platen roller are positioned on the second chassis. The print head is horizontally placed allowing paper to be directed toward a frontal part of the printer, and the platen roller is placed right above the print head. The cutting mechanism is positioned vertically with a slight inclination so that movement of the movable blade is in a direction perpendicular to a line formed between a rotation axis of a cover of the printer and a contract point between the movable blade and the fixed blade.