Abstract: A base structure of a retainer comprising a pair of wall members 2 formed of a columnar body, which is vertically long, has a groove 4 formed in its longitudinal direction and has locking sections 5 formed in plural portions for locking a sliding member 3 at plural portions in the groove, and the sliding member 3 which is slidable in the groove of the wall member 2 and removably fitted to the locking section 5 through movable locking pieces 7.

Abstract: A base structure of a retainer for a shelving comprising operation section supporters (2) which have plural locking sections (5) formed at prescribed intervals on flat surfaces of a flat and vertically long board-like material and a pair of shelf board supporting members (3) which are in engagement with the operation section supporters (2), slidable in the vertical direction and provided with movable locking pieces (11) removably engaged with the locking sections (5) of the operation section supporters (2), wherein the movable locking pieces 11 are automatically engaged with or removed from the locking sections (5).

Abstract: Catching grooves 2d, 2e are formed in a turning space 2f of a catching protrusion bar 2b, engagement projections 3c, 3d are formed on a standing part 3b of a catching member 3a, and the standing part 3b is inserted into the turning space 2f, so that the engagement projections 3c, 3d are respectively engaged with the catching grooves 2d, 2e by the own weight of the catching member 3a.