Abstract: There is provided a card file box comprising a pair of mirror-image side panels, a U-shaped member comprising a bottom panel, and front and rear end panels secured to the side panels to form a rigid structure and a tambour for slidingly enclosing the top of the box. The lateral edges of the tambour are slidably disposed in channels in the side panels. A removable clip at the bottom of the card file box forms a stop in the channel. Removal of the clip forms a passage for removal of the tambour. The card file box further comprises generally vertical ribs on the interior of each side panel for subdividing the interior of the box into card-supporting compartments and generally vertical ribs on the front and rear end panels for facilitating removal of cards adjacent to the end panels.