Commercial vehicle seat with rotatable seat part

The commercial vehicle seat (1) has a seat section (2) that is connected to upper support portion of a seat base supporting section. The base portion (10) is connected to a support base of the seat base supporting section. A rolling bearing is arranged between the support portion and the base portion. The rolling bearing is provided with a roller bearing ring which is circular around a fictitious rotation axis (6) extending in the vehicle seat height direction to rotate the support portion relative to the base portion.