To discriminate a housing position and to shorten a housing time by classifying by color a rack in accordance with the kind of plural different carriers housed into the rack.

Plural parting plates 11a, 11b, which are provided between a front surface plate 11F and a back surface plate 11B having a shape diagonally cut from the upper end toward the front side, are formed in a disk housing rack 3a. The disk numbers in a disk number indicating part 26 are color-printed or color-coated for every disk housing part 11 of the disk housing rack 3a in which disks 2 are housed, for example, white printing or white coating is applied to the disk numbers 1-49 and blue printing or blue coating is applied to the disk numbers 50-100. The kind of the disks 2 which are placed in the disk housing part 11 is indicated with a separate color in accordance with a difference such as the disk shape of CD, MD, DVD, etc., and disk housing contents. Which position different kinds of disks 2 should be housed in is recognized at a glance.