In a tape cartridge comprising a case body having an opening for viewing the amount of roll of tape, at least one hub accommodated in the case body for winding a recording tape, a plate for closing the opening and a braking member for stopping rotation of the hub when not in use, the plate is composed of a support plate and a transparent window plate portion and is assembled in the case body defining a gap g between the support plate and the inner face of the top wall of the case body. The brake member is slidably inserted in the gap g with a part of the brake member engaging a part of the hub to stop rotation thereof.