DIESEL ENGINE

A diesel engine including: a combustion chamber; a fuel charging means for charging fuel oil serving as an ignition source and gaseous ammonia into the combustion chamber, wherein fuel charging means forms a ammonia premixed gas in the combustion chamber by the fuel oil and the gaseous ammonia that are introduced into the combustion chamber, and performs mixed combustion, wherein setting means for setting a plurality of different ammonia mixing ratio values can be set, and a control means for adjusting an air excess ratio value in a sum of the fuel oil and the ammonia that are introduced by the charging means based on the ammonia mixing ratio value set by the setting means, are provided.