Vacuum cleaner (100; 300) having the following features: a first component group with an opening, wherein the first component group has a first part of a releasable locking device and a lug; and a second component group with an opening, wherein the second component group has a second part of the releasable locking device and a cut-out, wherein the cut-out is embodied to receive the lug of the first component group, wherein the first component group and the second component group can be connected via the lug introduced into the cut-out and the releasable locking device, so that the opening of the first component group faces the opening of the second component group, wherein the first component group comprises a dust box and the second component group comprises a separator unit; wherein the lug has a guide surface for the cut-out, wherein, in a region of the guide surface which is at a distance from the component group, the guide surface of the lug is inclined with a first inclination relative to an opening plane in which at least most of the opening of the first component group lies, and in a region of the guide surface which is close to the component group, the guide surface of the lug is inclined with a second inclination which is less than the first inclination relative to the opening plane, so that when the lug is introduced into the cut-out via the guide surface, the opening of the first component group in the region of the first inclination is moved more significantly in the direction of the opening of the second component group than in the region of the second inclination; characterised in that in the region which is close to the component group the lug has an essentially constant thickness and in the region which is at a distance from the component group has a thickness which increases up to the constant thickness; wherein the lug and the cut-out are embodied such that the lug, without clamping or hooking, can be introduced into the cut-out and removed from the cut-out; wherein the lug is embodied such that upon insertion into the cut-out the first component group slides in a raised manner above the region of the first inclination and on the region of the second inclination until the first part of the releasable locking device locks together with the second component group. a first component group with an opening, wherein the first component group has a first part of a releasable locking device and a lug; and a second component group with an opening, wherein the second component group has a second part of the releasable locking device and a cut-out, wherein the cut-out is embodied to receive the lug of the first component group, wherein the first component group and the second component group can be connected via the lug introduced into the cut-out and the releasable locking device, so that the opening of the first component group faces the opening of the second component group, wherein the first component group comprises a dust box and the second component group comprises a separator unit; wherein the lug has a guide surface for the cut-out, wherein, in a region of the guide surface which is at a distance from the component group, the guide surface of the lug is inclined with a first inclination relative to an opening plane in which at least most of the opening of the first component group lies, and in a region of the guide surface which is close to the component group, the guide surface of the lug is inclined with a second inclination which is less than the first inclination relative to the opening plane, so that when the lug is introduced into the cut-out via the guide surface, the opening of the first component group in the region of the first inclination is moved more significantly in the direction of the opening of the second component group than in the region of the second inclination; characterised in that in the region which is close to the component group the lug has an essentially constant thickness and in the region which is at a distance from the component group has a thickness which increases up to the constant thickness; wherein the lug and the cut-out are embodied such that the lug, without clamping or hooking, can be introduced into the cut-out and removed from the cut-out; wherein the lug is embodied such that upon insertion into the cut-out the first component group slides in a raised manner above the region of the first inclination and on the region of the second inclination until the first part of the releasable locking device locks together with the second component group.