Variable exhaust gas turbocharger

A variable exhaust gas turbocharger (1) for an internal combustion engine (10) having an exhaust gas turbine (2) and a compressor (3) with an adjustable inlet vane structure (4), the exhaust gas turbocharger (1) having a housing (1.1), a compressor wheel (3.1) with compressor wheel blades (3.2) connected to an exhaust gas turbine wheel via a shaft (1.2) for rotation therewith, said compressor having an inlet air duct (3.3) extending from an axial region to a radial region formed by a radial annular duct (3.3b)T upstream of the compressor wheel blades (3.2) in the direction of flow, said radial annular duct (3.3b) upstream of the compressor wheel (3.1) having an inlet area of constant axial width and, adjacent the inlet area, a compressor wheel area, wherein the axial width of the radial annular duct (3.3b) decreases in radial outward direction, said adjustable inlet vane structure (4) being disposed in the inlet area of constant axial width and comprising guide vanes of constant axial width and axially constant cross-section according to the inlet area of the radial annular duct (3.3b), whereas the axial width of the compressor wheel blades decreases in the radial outward direction in accordance with the annular duct area of decreasing axial width.