To provide a bookshelf device on a desk, which keeps a housing volume sufficient enough and easy to put books or the like neatly and tidily by widely utilizing a space above a top board in the bookshelf device disposed at the rear of the top board of a learning desk.

At least three rail members are vertically disposed at predetermined intervals in a back plate of the bookshelf device provided on the desk and disposed at the rear of the top board of the desk. Partition members, shelf board members, drawer members and a partitioning member provided with a height twice or larger than the space between upper/lower rail members nearest can be respectively, engageably/disengageably and breadthwise slidably fixed to each rail member, wherein the shelf board members and the drawing members can be vertically piled and fixed to the nearest upper/lower rail members.

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