A cam groove provided in a chassis is furnished with a first cam portion permitting an eject button to move only forward from being depressed, and a second cam portion permitting the button to shift between its depressed and protruding states. A slide unit interlocks with a switching lever spring-urged toward a push-out plate and moves away from a recording-medium travel path by being pushed by a recording medium when plugged into the chassis. In standby, the switching lever interlocks with the first cam portion, advancing into the travel path. With a recording medium bieng plugged into the chassis, by the eject button being pushed a first time the switching lever withdraws from the travel path and shifts into the second cam portion, permitting the eject button to protrude backward. By the eject button being pushed a second time, the push-out plate and slide unit are put into cooperation.