To provide a sliding device capable of attaining a good movement with a simple constitution while supporting office furniture on a base.

The support body 4 or the sliding device can slide and move along rail grooves 21, 22 formed in the base 2 and continuously opening, and has abutting bodies 4B1 capable of abutting on the wall faces of the rail grooves 21, 22, rolling bodies 4B3 capable of being spliced with the wall faces of the rails 21, 22, and a slide shifting mechanism 4B capable of being shifted between a movement allowing condition (F1) where the rolling bodies 4B3 are spliced with the wall faces of the rail grooves 21, 22 in preference to the abutting bodies 4B1 and a movement regulating condition (F2) where the rolling bodies 4B3 are spaced apart from the wall faces of the rail grooves 21, 22 ant the abutting bodies 4B1 are made to abut on the wall faces of the rail grooves 21, 22.