Image formation apparatus

An image formation apparatus for printing at least one of an image and a character on a medium, comprising:

• a medium storage cartridge which is mounted in the image formation apparatus and is capable of storing the medium with plural sizes;
• and
• a medium size detection device which is attached to the image formation apparatus and detects a size of the medium stored in the medium storage cartridge;
• wherein the medium storage cartridge comprises a medium back end stopper that is slidable inside the cartridge according to a size of the medium stored and holds the medium, and a protrusion part provided in a side of the medium storage cartridge and having plural protrusions, the protruding protrusions varying according to a position inside the medium storage cartridge of the medium back end stopper;
• the medium size detection device comprises a substrate attached in a position facing the protrusion part when the medium storage cartridge is mounted in the image formation apparatus, and a medium size detector which is grounded and has elasticity and electrical conductivity and is attached to a surface of the substrate and selectively makes contact with through holes provided in the substrate, one end of the medium size detector turning to the back of the substrate;
• and
• in a state in which the medium storage cartridge is mounted in the image formation apparatus, the protruding protrusions of the protrusion part press the medium size detector and the medium size detector makes contact with the through holes.