There is provided a slot-in type reproducing/recording apparatus in which a disk ,when ejected, stops at a predetermined position in front of the apparatus to be easily handled. A stop mechanism (59) includes an engagement pin (55) formed on an eject arm (52) and biased toward a selector plate (51) and the engagement recesses (51E, 51F) formed on the selector plate (51) and hold the engagement pin (55) in a manner that the disk is held by main arms and the eject arm (52). The selector plate (51) can move in a direction orthogonal to a disk-eject direction as the main arms open or close. Upon the ejection of the disk, the stop mechanism (59) stops the disk at a predetermined position in front of the apparatus so as to prevent the disk from jumping out from a slot (1A).