To easily select or take out a disk by turning one by one a disk case storing a disk.

A sliding shelf 3 is provided between side panels 2 facing sideways of a front open storage box 1. In structuring the sliding shelf 3, a plurality of perpendicular ribs 5 extending sideways in the full length are protrusively provided in back and forth directions on top of a horizontal face part 4 for forming a gap between the ribs 5 neighboring in a back and forth direction as a recess 6 for storing a disk, and a side face cover 8 is mounted on both right and left end faces of an extrusion molded slide shelf body 7. The sliding shelf 3 is freely drawn forward from the front opening 1a of the storage box 1.