A cassette tape ejecting apparatus has a chassis having a pin boss, a hook hole and a locking groove formed as a single body, a cassette housing installed on the chassis to be transferred to a tape insertion position and a tape ejection position, a cassette tape being mounted thereon, a locking lever being installed on the cassette housing, and having a locking protrusion hooked on the looking groove of the chassis when the cassette housing is transferred to the tape insertion position, an eject lever installed on the chassis to be rotated through the pin boss of the chassis in the forward/backward direction unlocks the locking protrusion from the locking groove of the chassis to eject the cassette tape, and a cassette switch turned on/off by the forward/backward rotation of the eject lever, for detecting ejection of the cassette tape.