Exhaust gas turbocharger with a shaft made of various materials

The invention relates to an exhaust gas turbocharger, which comprises a turbine housing, a bearing housing and a compressor housing and which is provided with a shaft mounted in the bearing housing. Within the compressor housing, the shaft is connected to a compressor wheel. Within the turbine housing, the shaft is connected to a turbine wheel. The shaft is composed of a plurality of shaft segments connected to one another, of which a first shaft segment is arranged in the turbine housing and a second shaft segment is arranged in the compressor housing. The shaft segment arranged in the turbine housing consists of a different material than the shaft segment arranged in the compressor housing.