A latching device for at least two housing parts, in which a snap-on connection as well as a latching connection between the housing parts is produced by a correspondingly designed rotary knob/pushbutton function. The actuating button preferably is respectively arranged on two opposing sidewalls of an upper housing part, wherein the actuating button respectively acts upon a spring lever that is arranged on the inner wall of the upper housing part.During assembly of the upper housing part and a lower housing part, a forced snap-on connection between the two housing parts is produced and can only be disengaged again by exerting pressure upon the actuating buttons on both sides.