Adjustable mounting device for a sliding element and sliding device

Mounting device includes a connecting bolt, plate-shaped sliding element connectable to a carriage held displaceable in a running rail. Mounting device includes holding rail, mountable in recess at upper side of the sliding element, and holding device held releasably in the holding rail, includes bearing device, adjustment screw is rotatably held, adjustment screw includes a screw shaft, aligned along screw axis, engages in threaded member of track body, movable along screw axis and includes two track walls aligned parallel to one another and include each a track element, which guide elements are engaged that are connected to connecting bolt, held in guide member displaceable along guide axis. Track sledge is equipped on opposite sides with guide elements engaged in track element of track body and connecting bolt includes first connecting part held in track sledge, second connecting part held in guide member and third connecting part connectable to carriage.