In the present invention, the upper cover 10 is formed on the left side of the base plate 11 with one layer of cover plate 12 attached to the left side of the thicker and the right side is made of a thin end, the extension portion 21 of the lower cover 20 Wraps up the belly 31 of the album to 30 and then overlaps and closes on the right base plate 11 of the upper cover 10 to form a two-stage cover, and the upper cover 10 and the lower cover 20 magnets. In the graduation album having a three-stage cover structure, which is locked by a magnet locking device 40 consisting of a 41 and a magnet pair 42, the magnet 41 constituting the magnet locking device 40 has an upper cover. The magnet inserted into the magnet hole 411 formed on the line of the base plate 11 where the edge meets when the plate 12 is attached to the previous step of attaching the plate 12 constituting the 10 and inserted into the magnet hole. More than half of the surface is covered by the plate 12 to maintain a fixed state, and the remaining exposed portion is the edge of the lower cover extension 21 Wrapping relates to a three-stage of annual magnetic structure having a cover lock, characterized in that in direct contact with the fixed magnet pair 42 in the form.
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