Patent ID: 8052141

Claim:
A recording-medium storage device comprising: a recording-medium storing unit, arranged in a main body of the recording-medium storage device, to store a recording medium; an edge guiding unit to guide an edge of the recording medium, movable in a direction to regulate the edge of the recording medium, the edge guiding unit including a first locking member and a second locking member; a first engaging member for a standard size of the recording medium, arranged in the main body, to make a first engagement with the first locking member to lock the edge guiding unit; and a second engaging member for non-standard size of the recording medium, arranged in the main body, to make a second engagement with the second locking member to lock the edge guiding unit, the second engaging member being different in shape than the first engaging member and an arrangement interval of the second engaging member being smaller than an arrangement interval of the first engaging member, wherein the first locking member is movable from an engaging position engaged with the first engaging member to a first retract position and a second retract position, when the first locking member moves from the engaged position to the first retract position to release the engagement of the first engagement, the second engagement is released, and when the first locking member moves from the engaging position to the second retract position in order to release the first engagement the second engagement being maintained.