a damping device for movable furniture part , includes a damper housing , a fluid chamber which is arranged in the damper housing and in which a piston is movably mounted , a tappet which is connected to the piston , at least one seal being arranged between the damper housing and the tappet in order to seal the fluid chamber , wherein the tappet passes through the seal , a compensating chamber which is fluidically connected to the fluid chamber , which runs laterally parallel to the fluid chamber . at least one deformable compensating body is arranged in the compensating chamber in order to compensate for a volume change due to the tappet being immersed into the fluid chamber . the deformable compensating body and the at least one seal are designed together as a single piece .