Internal combustion engine

An internal combustion engine, comprising:

• a first exhaust manifold in which gas discharged from a first cylinder group of the internal combustion engine flows;
• a second exhaust manifold in which gas discharged from a second cylinder group that is different from the first cylinder group flows;
• and
• a turbocharger having a first scroll chamber that communicates with the first exhaust manifold and a second scroll chamber that communicates with the second exhaust manifold,
• in which a surface area of a wall surface of the first exhaust manifold is larger than a surface area of a wall surface of the second exhaust manifold,
• wherein the turbocharger comprises
• a turbine housing including the first scroll chamber and the second scroll chamber that are divided by a partition wall from each other in an axial direction of a turbine wheel,
• a first cooling water passage provided in the turbine housing to cover the first scroll chamber, and
• a second cooling water passage provided in the turbine housing to cover the second scroll chamber,
• the internal combustion engine comprises a cooling device that causes cooling water to flow in the first cooling water passage and the second cooling water passage, and
• the cooling device is configured so that a temperature of cooling water that is introduced into the second cooling water passage becomes lower than a temperature of cooling water that is introduced into the first cooling water passage.