Multistage exhaust turbocharger

A multistage exhaust turbocharger for an internal combustion engine, the multistage exhaust turbocharger comprising:

• a low-pressure stage turbocharger having a low-pressure turbine housing including a low-pressure turbine;
• a high-pressure stage turbocharger having a high-pressure turbine housing including a high-pressure turbine drivable by exhaust gas exhausted from an exhaust manifold of the internal combustion engine, and having a high-pressure compressor cover including:
• a compressor inlet passage located between an air supply channel that is connected to an outlet of a low-pressure compressor and an inlet of a high-pressure compressor;
• and
• a bypass inlet passage diverged from the compressor inlet passage;
• a switching aperture formed between the compressor inlet passage and the bypass inlet passage;
• a compressor bypass valve device attached to the high-pressure compressor cover, the compressor bypass valve device for opening and closing the switching aperture;
• and
• a bypass outlet pipe part connected to the bypass inlet passage, and located adjacent, via a partition wall, to a case having the compressor bypass valve device therein, the bypass outlet pipe part being formed integrally with the high-pressure compressor cover so as to extend at a right angle to a rotation axis of the high-pressure compressor.