To provide a erroneous deletion prevention mechanism of a cassette tape capable of detecting whether the tape is in write inhibition state or not and of detecting the presence of erroneous deletion prevention pawl of the cassette tape just before moving to horizontal direction for this cassette tape is inserted into a tape station.

A guide rail groove is provided inside face of the wall part of near place to cassette tape insertion opening 11 of the video station 1, a slidable slide moving member 3 is arranged to the guide rail groove 13. Then when the slide moving member 3 moves to the cassette insertion opening 11 side, a elastic contact piece 4 which detects the presence of the erroneous deletion prevention pawl 21 is provided one side of the slide moving member 3, when a elastic contact piece 4 is extended engaging to the erroneous deletion prevention pawl 21, a contact part 5 is contacted and conducted to detect the presence of the erroneous deletion prevention pawl 21.