The tape cartridge according to the present invention is provided with a slider member (13) slidably mounted for sliding movement in forward and backyard directions at an outer side under surface on the bottom wall of a main casing (1) for closing and opening a pocket 5, a front lid (11) pivotally connected to the main casing (1) for covering a front face of the main casing (1), and an upper lind (12) for closing the open upper face of the pocket (5). A front edge of the upper lid (12) is pivotally connected to an upper edge of the front lid (11) through pins (20). When the front lid (11) is pivoted for upward opening, the upper lid (12) is displaced for retreat to a rear side from an open upper face of the pocket (5) in association with the movement of the front lid (11).