DIESEL ENGINE

A diesel engine includes: an injector ; a control device which controls an injection timing of fuel injected from the injector ; and exhaust circulating means. The control device controls the injection timing of main injection and pre-injection performed prior to the main injection and executes control such that, by ensuring a premixing period of the pre-injection from start of the pre-injection until ignition of an air-fuel mixture of the fuel injected by the pre-injection and the air AR, a homogenous and lean premixed air-fuel mixture is generated in the auxiliary combustion chamber by the fuel injected by the pre-injection and air AR, and the premixing period of the main injection from the start of the main injection until ignition of the air-fuel mixture of the fuel injected by the main injection and the air AR is ensured.