Cassette with openable/closable frame retains the board carrier stored in the cassette at a predetermined position during a process of moving the cassette or starting to move and stopping movement without sliding or falling from the cassette

A cassette with openable/closable frame is provided. During the process of transporting a current cassette placing and storing a board or a board carrier, due to the law of inertia in an acceleration or deceleration motion, the board or board carrier easily and outwardly slides or falls from the cassette or collides toward the inside of the cassette, resulting in damaging the cassette, the board or the board carrier. Thus, the present invention provides a cassette having movable frames and fixed frames that retain the board carrier stored in the cassette at a predetermined position during a process of moving the cassette or starting to move and stopping movement without sliding or falling from the cassette. The cassette comprises a main body, two fixed frames and two movable frames. The main body comprises a side structure, a bottom structure, a top structure, a corner post structure, a plurality of first connection members, and a plurality of second connection members. The side structure comprises two side p