To prevent a sensor from becoming unable of detection, the sensor to detect a detection object moving along a supply magazine even when the supply magazine moves.

A magazine base 32 mounting a supply magazine 90 movable along the width direction of a print paper, as continuously in contact with a support member 46 supporting a magazine code sensor 40 to detect a magazine code 95 attached to the supply magazine 90, presses the support member 46. The support member 46 is energized in a direction toward the magazine base 32 by an energizing mechanism 50 having a first fixed member 51 fixed to a print chassis 3, a rivet 54 extended in a vertical direction as well as fixed to the print chassis 3 and loosely fitted to an opening 42a formed in the support member 46, and a spring 55 disposed along the width direction of a print paper 2, with one end of the spring attached to the support member 46 and the other end attached to the first fixing member 51.