Exhaust-gas turbocharger

An exhaust-gas turbocharger (1), having a compressor (2) which has a compressor housing (3) housing a compressor wheel (3′);

• a turbine (4) which has a turbine housing (5) housing a turbine wheel (4′), the compressor wheel (3′) connected to the turbine wheel (4′) via a shaft (24) having an axis of rotation (L);
• a bypass duct connected to a turbine housing inlet (19) or a compressor housing outlet comprising a cylindrical guide spigot (14);
• and a compressor-side or turbine-side charge pressure regulating device (6) which has a shut-off element (7) which opens or closes a flow opening (9) in said cylindrical guide spigot (14), wherein the shut-off element (7) is in the form of a slide head (10) which is mounted on a guide (8) formed by a cylindrical outer wall (15) of said cylindrical guide spigot (14) so as to be longitudinally displaceable along a longitudinal central line (LMs) of the guide (8) between a closed position and an open position, the flow opening (9) partially encircling said cylindrical outer wall (15) of said cylindrical guide spigot (14) and being arranged at least substantially at a right angle with respect to the longitudinal central line (LMs) of the guide (8), wherein the cylindrical guide spigot (14) has a face wall (16) that adjoins and closes off an end of the cylindrical outer wall (15), wherein the charge pressure regulating device (6) is (a) a wastegate arrangement of the turbine housing (5) wherein the shut-off element opens or closes a bypass of the turbine (4) or (b) a compressor bypass arrangement of the compressor housing (3) wherein the shut-off element opens or closes the compressor bypass arrangement of the compressor housing (3), and the slide head (10) is connected to a slide rod (11), and the slide head (10) is pot-shaped with a cylindrical guide and seal wall (13), and wherein the longitudinal central line (LM8) of displacement of the guide (8) is offset from the axis of rotation (L).