A card cassette device configured to be mountable on a main unit of a target apparatus, comprising: a body having a storing section for storing cards and a card outlet for sending out the cards, wherein the storing section is formed in the body and the card outlet is formed in a front part of the body; a shutter for opening and closing the card outlet, wherein the shutter is movable along the front part of the body and has a stopper member engaging hole and a lock member engaging hole; a stopper member provided on the body, wherein the stopper member is engageable with the stopper member engaging hole of the shutter; a stopper member moving device for moving the stopper member and/or the stopper member engaging hole to perform engagement or disengagement of the stopper member with/from the stopper member engaging hole; a lock member provided on the body, wherein the lock member is engageable with the lock member engaging hole of the shutter; and a lock member moving device for moving the lock member and/or the lock member engaging hole to perform engagement or disengagement of the lock member with/from the lock member engaging hole; wherein the stopper member, the stopper member engaging hole, and the stopper member moving device constitute a shutter fixing mechanism for fixing the shutter in its closed state; the lock member, the lock member engaging hole, and the lock member moving device constitute an open state locking mechanism for canceling the closed state of the shutter and locking the shutter in its open state; the shutter fixing mechanism is configured in such a way that the closed state of the shutter generated by the shutter fixing mechanism is unable to be eliminated without mounting the card cassette device on a main unit of a card dispensing apparatus; and the open state locking mechanism is configured in such a way that the open state of the shutter is able to be generated and locked by operating the lock member moving device after releasing a shutter movement preventing operation by the shutter fixing mechanism in a mounted state where the card cassette device is mounted on the main unit. a body having a storing section for storing cards and a card outlet for sending out the cards, wherein the storing section is formed in the body and the card outlet is formed in a front part of the body; a shutter for opening and closing the card outlet, wherein the shutter is movable along the front part of the body and has a stopper member engaging hole and a lock member engaging hole; a stopper member provided on the body, wherein the stopper member is engageable with the stopper member engaging hole of the shutter; a stopper member moving device for moving the stopper member and/or the stopper member engaging hole to perform engagement or disengagement of the stopper member with/from the stopper member engaging hole; a lock member provided on the body, wherein the lock member is engageable with the lock member engaging hole of the shutter; and a lock member moving device for moving the lock member and/or the lock member engaging hole to perform engagement or disengagement of the lock member with/from the lock member engaging hole; wherein the stopper member, the stopper member engaging hole, and the stopper member moving device constitute a shutter fixing mechanism for fixing the shutter in its closed state; the lock member, the lock member engaging hole, and the lock member moving device constitute an open state locking mechanism for canceling the closed state of the shutter and locking the shutter in its open state; the shutter fixing mechanism is configured in such a way that the closed state of the shutter generated by the shutter fixing mechanism is unable to be eliminated without mounting the card cassette device on a main unit of a card dispensing apparatus; and the open state locking mechanism is configured in such a way that the open state of the shutter is able to be generated and locked by operating the lock member moving device after releasing a shutter movement preventing operation by the shutter fixing mechanism in a mounted state where the card cassette device is mounted on the main unit.