A recording and/or playback apparatus that uses a tape cassette having protrusions is equipped with a mounting section, a lid, a holder, and a detection mechanism. The mounting section is to be mounted with a tape cassette. The lid, which is to open or close the mounting section, is provided so as to be movable between a closed position for closing the mounting section and an open position for opening the mounting section. The lid is provided in front of the holder. The holder holds a tape cassette that has been inserted in the apparatus, and causes the tape cassette held by the holder to be mounted in the mounting section when the lid is moved to the closed position. The detection mechanism indicates whether a tape cassette is mounted in the mounting section. When the lid is located at the closed position, the protrusion of the tape cassette that is mounted in the mounting section manipulates the detection mechanism so that the detection mechanism projects from the front surface of the lid.