To provide a study desk provided with a light-weight book partitioning member which can cope with large-sized books to be placed and can be easily attached, detached and slid to the right and left.

The study desk is provided with the book partitioning member 3 attached to a bookshelf body 2 on a flat desk 1 so as to be freely slid to the right and left and freely attached and detached. At the vertical rear wall part 11 of the bookshelf body 2, a belt-like window part 4 in a horizontal direction is opened. Also, for the book partitioning member 3, an angle part having a horizontal piece part and a suspended piece part connected to the front end of the horizontal piece part is provided on the lower end and a holding member 7 having a channel part opened upwards in the plane view on the upper end is provided on the rear end. The channel part of the holding member 7 is locked in the shape of being externally fitted to the lower end part of an upper side forming member 8 forming the upper side of the belt-like window part 4. Also, the angle part 6 of the holding member 7 is mounted on the upper end part of a lower side forming member 9 forming the lower side of the belt-like window part 4 in the shape of being pushed in from the front to the rear part.