Cleaning machine having a cleaning head (40; 174) at which at least one cleaning unit is arranged, wherein the at least one cleaning unit (154, 156) comprises: - a drive motor having a drive shaft which is rotatable about a drive shaft rotation axis; - a cleaning roller shaft; - a cleaning roller which is arranged at the cleaning roller shaft, and - a gear device which is operatively coupled to the drive shaft for torque communication therewith and is operatively coupled to the cleaning roller shaft for torque communication therewith, wherein the drive shaft comprises a first coupling region for the gear device with a first face end, and the cleaning roller shaft comprises a second coupling region for the gear device with a second face end, and wherein the first face end of the drive shaft is in spaced relation to the second face end of the cleaning roller shaft in a direction parallel to the drive shaft rotation axis, and wherein the gear device is of multi-stage configuration and bridges a distance between the first coupling region and the second coupling region in the direction parallel to the drive shaft rotation axis, characterized in that formed at the cleaning head (40; 174) is a geometric step region (158; 188) having a first region and a second region, wherein the second region has, in a height direction transverse to the drive shaft rotation axis, a smaller height than the first region, and the first coupling region is located at the first region and the second coupling region is located at the second region. - a drive motor having a drive shaft which is rotatable about a drive shaft rotation axis; - a cleaning roller shaft; - a cleaning roller which is arranged at the cleaning roller shaft, and - a gear device which is operatively coupled to the drive shaft for torque communication therewith and is operatively coupled to the cleaning roller shaft for torque communication therewith, wherein the drive shaft comprises a first coupling region for the gear device with a first face end, and the cleaning roller shaft comprises a second coupling region for the gear device with a second face end, and wherein the first face end of the drive shaft is in spaced relation to the second face end of the cleaning roller shaft in a direction parallel to the drive shaft rotation axis, and wherein the gear device is of multi-stage configuration and bridges a distance between the first coupling region and the second coupling region in the direction parallel to the drive shaft rotation axis, characterized in that formed at the cleaning head (40; 174) is a geometric step region (158; 188) having a first region and a second region, wherein the second region has, in a height direction transverse to the drive shaft rotation axis, a smaller height than the first region, and the first coupling region is located at the first region and the second coupling region is located at the second region. wherein the drive shaft comprises a first coupling region for the gear device with a first face end, and the cleaning roller shaft comprises a second coupling region for the gear device with a second face end, and wherein the first face end of the drive shaft is in spaced relation to the second face end of the cleaning roller shaft in a direction parallel to the drive shaft rotation axis, and wherein the gear device is of multi-stage configuration and bridges a distance between the first coupling region and the second coupling region in the direction parallel to the drive shaft rotation axis, characterized in that formed at the cleaning head (40; 174) is a geometric step region (158; 188) having a first region and a second region, wherein the second region has, in a height direction transverse to the drive shaft rotation axis, a smaller height than the first region, and the first coupling region is located at the first region and the second coupling region is located at the second region.