A cartridge holder is disclosed that includes a cartridge supporting
member that supports an inserted cartridge corresponding to a first
cartridge or a thicker second cartridge; a cartridge upper face holding
member that is normally positioned at a first height position for holding
down the first cartridge; a cartridge upper face holding member
supporting mechanism configured to move the cartridge upper face holding
member with respect to the cartridge supporting member; and a lock
mechanism configured to lock the cartridge upper face holding member in
the first height position. The cartridge supporting member and the
cartridge upper face holding member define a cartridge accommodating
space. The lock mechanism remains locked when the first cartridge is
inserted, and unlocks when the second cartridge is inserted. When the
second cartridge is inserted, the cartridge upper face holding member is
raised, and the size of the cartridge accommodating space is changed.