A housing apparatus of a tape recorder for recording or reproducing signals on a tape transferred along a certain travelling path and including a main deck having a travelling system, a lever member hingedly coupled with one side of the main deck, a plate member vertically moved up and down on the main deck by the lever member, and a cassette holder horizontally moved on the plate member, so that when the lever member is rotated up and down, a side gear mounted on the plate member is brought into meshing engagement with a rack gear positioned on the lever member, and the cassette holder positioned on the plate member is slidably moved by an interlocking device connected to the side gear, thereby loading and ejecting the cassette tape. Therefore, the sequential operations of loading and ejecting the cassette tape are smoothly and harmoniously performed without requiring a separate motor or structural devices.