Hybrid drive of a motor vehicle, which has an automated shift gearbox (2.1 - 2.20) derived from a dual-clutch gearbox (2.0) with two coaxially arranged input shafts (GE1, GE2) and a common output shaft, one input shaft (GE1; GE2) of which can be connected to the drive shaft of an internal combustion engine and can be connected in terms of drive to the output shaft by way of an associated first group of selectively shiftable gearwheel sets (5, 7, 9, 10; 6, 8), and the other input shaft (GE2; GE1) of which is connected in terms of drive to the rotor of an electric machine, operable as a motor and as a generator, and can be connected in terms of drive to the output shaft by way of an associated second group of selectively shiftable gearwheel sets (6, 8; 5, 7, 9, 10), wherein - the gearwheel sets (5 - 10) are arranged in each case between one of the two input shafts (GE1, GE2) and one of two countershafts (VG1, VG2), which are connected in terms of drive to the output shaft by way of in each case one output constant (KA1, KA2), - each gearwheel set (5 - 10) comprises a fixed gear (11 - 13), arranged rotationally conjointly on the associated input shaft (GE1, GE2), and a floating gear (14 - 19), arranged on the respective countershaft (VG1, VG2), - for each input shaft (GE1, GE2), at least the two gearbox-inner gearwheel sets (7, 9; 6, 8) are arranged, with floating gears (16, 18; 15, 17) arranged on different countershafts (VG1, VG2), and utilizing a common fixed gear (12, 13), in a common radial plane, - at least two floating gears (15, 16), arranged on one of the two countershafts (VG1, VG2), of gearbox-inner gearwheel sets (6, 7) assigned to two different input shafts (GE1, GE2) can be coupled to one another by way of a torsion shift element, and - the two output constants (KA1, KA2) are arranged, utilizing a common drive output gear arranged on the output shaft, in a common radial plane, characterized in that - one input shaft (GE1; GE2) is arranged centrally and projects out of a housing face wall of the shift gearbox (2.1, 2.2, 2.5, 2.6, 2.7, 2.10, 2.11, 2.12, 2.15, 2.16, 2.17, 2.20), axially at one side, - the other input shaft (GE2; GE1) is in the form of a hollow shaft and is arranged coaxially over said one input shaft (GE1 or GE2) and projects out of the housing face wall axially at the same side, and - the internal combustion engine is arranged on the gearbox-outer end (23, 24) of the central input shaft (GE1 or GE2) and the electric machine is arranged axially at the same side on the gearbox-outer end (24, 23) of the input shaft (GE2 or GE1) in the form of a hollow shaft. - the gearwheel sets (5 - 10) are arranged in each case between one of the two input shafts (GE1, GE2) and one of two countershafts (VG1, VG2), which are connected in terms of drive to the output shaft by way of in each case one output constant (KA1, KA2), - each gearwheel set (5 - 10) comprises a fixed gear (11 - 13), arranged rotationally conjointly on the associated input shaft (GE1, GE2), and a floating gear (14 - 19), arranged on the respective countershaft (VG1, VG2), - for each input shaft (GE1, GE2), at least the two gearbox-inner gearwheel sets (7, 9; 6, 8) are arranged, with floating gears (16, 18; 15, 17) arranged on different countershafts (VG1, VG2), and utilizing a common fixed gear (12, 13), in a common radial plane, - at least two floating gears (15, 16), arranged on one of the two countershafts (VG1, VG2), of gearbox-inner gearwheel sets (6, 7) assigned to two different input shafts (GE1, GE2) can be coupled to one another by way of a torsion shift element, and - the two output constants (KA1, KA2) are arranged, utilizing a common drive output gear arranged on the output shaft, in a common radial plane, - one input shaft (GE1; GE2) is arranged centrally and projects out of a housing face wall of the shift gearbox (2.1, 2.2, 2.5, 2.6, 2.7, 2.10, 2.11, 2.12, 2.15, 2.16, 2.17, 2.20), axially at one side, - the other input shaft (GE2; GE1) is in the form of a hollow shaft and is arranged coaxially over said one input shaft (GE1 or GE2) and projects out of the housing face wall axially at the same side, and - the internal combustion engine is arranged on the gearbox-outer end (23, 24) of the central input shaft (GE1 or GE2) and the electric machine is arranged axially at the same side on the gearbox-outer end (24, 23) of the input shaft (GE2 or GE1) in the form of a hollow shaft.