A damping device for movable furniture parts includes a base, a movable member defining a path, a housing movably connected to the path and including a space and an opening which communicates with the space, a damper located in the space and including a cylinder and a piston rod which has one end inserted into the cylinder and the other end of the piston rod extends from the cylinder, a first threaded member connected to the cylinder including, a second threaded member connected to the first threaded member and located corresponding to the opening of the housing, an adjustment member movably connected between the base and the movable member. When rotating the second threaded member, a distance between the housing and the movable member is adjusted. When the adjustment member is adjusted, the relative distance between the base and the movable member is adjusted.