A couch apparatus for medical use, comprising a lower base fixed on the floor, an elevating mechanism mounted on the lower base, an upper base fixed on the elevating mechanism, a tabletop mounted slidably on the upper base, and a tabletop slide mechanism. The tabletop is provided with a belt having end portions fixed to end portions of the tabletop along the longitudinal axis of the tabletop. The belt has a slack intermediate portion. The upper base is provided with a drive pulley which engages the intermediate portion of the belt. The upper base is also provided with driving means for rotating the drive pulley and with belt guide rollers for restricting lateral motion of the belt as the drive pulley moves the belt and tabletop longitudinally.