An automatic disc changer has a casing for the automatic disc changer, and a plurality of disc holders arranged in the casing. The disc holder stores a plurality of disks in vertical positions. A reproducing device is provided in the casing to be moved along the disc holder. A movable frame is provided on the disc holder to be shifted by a pitch of the space in a direction of the arrangement of the disc holders. A plurality of guide projections are provided on the movable frame, which are disposed adjacent to ends of the holding plates. The guide projections are arranged by a pitch which is twice as much as the pitch of the space. Each guide projection has a triangular section, the bottom of which is approximately equal to a width of the space, so as to close a corresponding space.