A reel table moving device for a video cassette tape recorder includes a mechanism for automatically positioning a pair of reel tables in response to insertion of a predetermined size video cassette without the need for an independent drive motor or sensor. The device includes a pair of protrusions mounted to opposite end portions of a moving member which are adapted to engage the tape cassette being inserted into the inlet port. The moving member moves in response to insertion of the tape cassette into the inlet port. In turn, an actuating member is connected to and moves in response to the movement of the moving member for causing the reel tables to move to a desired position for receiving a predetermined size tape cassette.