Mixing device of an exhaust gas purification system of a motor vehicle internal combustion engine for mixing urea solution with exhaust gas of the internal combustion engine, the device comprising - a straight, circular cylindrical swirl tube with a first end and a second end opposite the first end and with a circumferential surface having a cut-out opening, - a circular cylindrical mixing tube, a section of which is located in the swirl tube and which is coaxial therewith, and which has an open first end located within the swirl tube and penetrates a base part of the second swirl tube end, - an exhaust gas feed tube, which terminates into the swirl tube at least approximately tangentially in such a way that exhaust gas can enter the swirl tube at least approximately tangentially from the exhaust gas feed tube via the cut-out opening in the circumferential surface of the swirl tube and, following its entry into the swirl tube, forms a flow which rotates about the mixing tube, wherein it completely enters into the open first end of the mixing tube while maintaining a rotating flow and completely leaves the interior of the swirl tube through the mixing tube, - a metering device located at the first end of the swirl tube and capable of spraying urea solution into the swirl tube with a conical spray pattern, so that it enters into the open first end of the mixing tube at least substantially completely and is entrained by the rotating flow of the exhaust gas and, together with the exhaust gas, is discharged from the interior of the swirl tube through the mixing tube, and - a funnel element, which conically opens in the direction of the open first mixing tube end and has a cone axis which is at least approximately collinear with the swirl tube axis and into which the metering device can spray the urea solution at least approximately completely, - the diameter of the larger funnel element opening being approximately half the mixing tube diameter. - a straight, circular cylindrical swirl tube with a first end and a second end opposite the first end and with a circumferential surface having a cut-out opening, - a circular cylindrical mixing tube, a section of which is located in the swirl tube and which is coaxial therewith, and which has an open first end located within the swirl tube and penetrates a base part of the second swirl tube end, - an exhaust gas feed tube, which terminates into the swirl tube at least approximately tangentially in such a way that exhaust gas can enter the swirl tube at least approximately tangentially from the exhaust gas feed tube via the cut-out opening in the circumferential surface of the swirl tube and, following its entry into the swirl tube, forms a flow which rotates about the mixing tube, wherein it completely enters into the open first end of the mixing tube while maintaining a rotating flow and completely leaves the interior of the swirl tube through the mixing tube, - a metering device located at the first end of the swirl tube and capable of spraying urea solution into the swirl tube with a conical spray pattern, so that it enters into the open first end of the mixing tube at least substantially completely and is entrained by the rotating flow of the exhaust gas and, together with the exhaust gas, is discharged from the interior of the swirl tube through the mixing tube, and - a funnel element, which conically opens in the direction of the open first mixing tube end and has a cone axis which is at least approximately collinear with the swirl tube axis and into which the metering device can spray the urea solution at least approximately completely, - the diameter of the larger funnel element opening being approximately half the mixing tube diameter.