Abstract: In a cassette tape recorder including cassette receiving means pivotable between an inclined position where a cassette can be inserted therein or removed therefrom and a horizontal position where the cassette is held so that a magnetic tape contained therein can be transported, a cassette eject mechanism comprising cassette force-out means mounted on the cassette receiving means and pivotable between a first position which it is made to assume when the cassette receiving means is at the inclined position and a second position which it is made to assume when the cassette receiving is at the parallel position, and lock means mounted on the cassette receiving means for acting to lock the cassette force-out means in the second position upon the cassette being fully inserted in the cassette receiving means and to unlock the cassette force-out means when the cassette receiving means is pivoted from the inclined position to the parallel position.