Abstract: The tape recorder is provided with a cassette guiding device including a tiltable cassette loading platform pivotably mounted at one end, spring means for normally holding the platform in an inclined position for receiving an inserted cassette and for permitting the platform to rotate to the horizontal position, a guide member for loading the cassette at an operating position when the platform is rotated to the horizontal position. A cassette containing chamber is formed by a cassette inserting section provided with an opening for passing the cassette, a door for normally closing the opening and shoulders for guiding the cassette to the platform, and a cassette loading section containing the cassette loading platform. There is provided a door operating mechanism including a door locking member for locking the door in the opened position, a sliding member interlocked with the door locking member, and a door operating button mounted on the sliding member for causing the door locking member to release the door.