To store articles under top plates of a desk without reducing a storage space of a fixture body.

A pair of left/right movable top plates 4 are provided on the upper surface of the fixture body 3 with an opened front surface movably in the left/right direction so as to move between a use position wherein the plates become horizontal in the upper part of the fixture body 3 and a fold position wherein the plates suspend along the both sides of the fixture body 3 by downward turning in both side ends of the fixture body 3.