A camshaft adjuster having a pot-like stator drivable by a crankshaft of an internal combustion engine; and a rotor rotationally fixedly connected to a camshaft of the internal combustion engine; having an outer ring and an inner ring arranged concentrically with respect to the outer ring; and radially oriented webs connecting the outer ring and the inner ring to each other, which subdivide the annular space formed between the outer ring and the inner ring into working chambers, wherein the working chambers are subdivided into oppositely acting pressure chambers by stator webs connected to the stator and projecting laterally into the working chambers; and the rotor is mounted by the outer ring in the radial direction on a cylindrical wall of the pot-like stator, wherein at least one depression forming a pocket to receive hydraulic oil is provided on the radial outer side of the outer ring and/or on the radial inner side of the cylindrical wall of the pot-like stator.