Exhaust gas turbine of an exhaust gas turbocharger having a wastegate valve device, which has: - a turbine housing having a housing wall and a bearing bore passing through the housing wall, - a bearing bush, which is arranged in the bearing bore of the turbine housing in such a way as to be fixed in a gastight manner, - a wastegate valve device having a valve spindle, wherein the valve spindle is passed outwards from the interior of the turbine housing through the housing wall in an axial direction in the bearing bush and is mounted in the bearing bush so as to be rotatable about its spindle axis, - wherein the valve spindle has, in the interior of the turbine housing, a valve spindle shoulder and a valve flap arranged at the end of the valve spindle, and - wherein an adjusting lever having an adjusting lever connecting flange is arranged on the valve spindle on the outside of the turbine housing in order to actuate the wastegate valve device, characterized in that the bearing bush intermeshes in the axial direction in the manner of a labyrinth seal at its axial ends with the adjusting lever connecting flange on the outside of the turbine housing and with the valve spindle shoulder in the interior of the turbine housing, in each case by means of at least one axially extending sealing web and at least one sealing groove, complementary thereto, which are circumferential with respect to the spindle axis, for gastight separation of the interior of the turbine housing from the environment. - a turbine housing having a housing wall and a bearing bore passing through the housing wall, - a bearing bush, which is arranged in the bearing bore of the turbine housing in such a way as to be fixed in a gastight manner, - a wastegate valve device having a valve spindle, wherein the valve spindle is passed outwards from the interior of the turbine housing through the housing wall in an axial direction in the bearing bush and is mounted in the bearing bush so as to be rotatable about its spindle axis, - wherein the valve spindle has, in the interior of the turbine housing, a valve spindle shoulder and a valve flap arranged at the end of the valve spindle, and - wherein an adjusting lever having an adjusting lever connecting flange is arranged on the valve spindle on the outside of the turbine housing in order to actuate the wastegate valve device, - wherein the valve spindle has, in the interior of the turbine housing, a valve spindle shoulder and a valve flap arranged at the end of the valve spindle, and - wherein an adjusting lever having an adjusting lever connecting flange is arranged on the valve spindle on the outside of the turbine housing in order to actuate the wastegate valve device, characterized in that the bearing bush intermeshes in the axial direction in the manner of a labyrinth seal at its axial ends with the adjusting lever connecting flange on the outside of the turbine housing and with the valve spindle shoulder in the interior of the turbine housing, in each case by means of at least one axially extending sealing web and at least one sealing groove, complementary thereto, which are circumferential with respect to the spindle axis, for gastight separation of the interior of the turbine housing from the environment.