PURPOSE: To load and eject a cassette easily and definitely by making it possible to load the cassette only by pushing a cassette insertion sensing lever and also by accumulating cassette ejecting energy from the power source of a tape recorder.

CONSTITUTION: Once cassette A is inserted into the cassette insertion mouth of container 2, cassette insertion sensing lever 7 turns to make sliding plate 3 slide forward, container 2 moves to load the cassette at a recording reproduction position, and an electromagnetic lock mechanism is in a lock state, so that the tape recorder will be ready to operate. Then, sliding plate 3 slides forward to wind reset spring 19 of the ejection mechanism, thereby storing ejection power. Pushing an ejection button allows sliding plate 3 to return by the power of reset spring 19, and consequently container 2 returns to the insertion position to turn sensing lever 7, so that cassette A will be pushed out from the insertion mouth. In this way, the cassette is loaded and ejected easily and definitely.