A tape pack ejecting mechanism wherein a tape pack is loaded and unloaded into and from a pack receiving structure pivotally connected at one end portion thereof to a chassis so as to allow pivotal movement thereof, locking of the pack receiving structure in a tilted position is released by loading of the tape pack, bringing the tape pack into a horizontal playback position, and the pack receiving structure is again tilted through rotation of an engaging member upon depressing of an eject lever to eject the tape pack, which mechanism is characterized by a guide provided at one side portion of the pack receiving structure for guiding the loading and unloading of the tape pack; and eject operating member with a tension spring attached thereto which is slidably provided on the guide; said eject operating member having a hanging portion engageable with a rear end of the tape pack and a projection engageable with a lock portion formed on the engaging member; said tension spring being biased to urge when the tape pack is loaded into a playback mode; said engaging member being reset by the rebounding force of the urged spring to eject the tape pack through the operation of the engaging member rotated upon eject operation by the eject lever.