Abstract: A shifting device for a dual clutch transmission as a speed-change transmission for motor vehicles, including two coaxially arranged input shafts, each being activatable via a clutch, an axially parallel output shaft and gearwheel sets that are mounted on the shafts and can be shifted by means of shifting clutches to allow a plurality of forward gears and a reverse gear, the gearwheel sets being subdivided into a sub-transmission having the one input shaft and a sub-transmission having the other input shaft. To achieve a wider gear-ratio spread in a structurally compact construction, a planetary gear train that can be shifted between two gear ratio stages is mounted upstream of the sub-transmission having the hollow input shaft.