To purify exhaust gas and reduce fuel consumption by executing proper fuel injection in all operation regions of an engine, while realizing premixed compression ignition combustion.

This direct injection type diesel engine is provided with a normal injection mode for injecting fuel by timing I in the vicinity of a compression top dead point of a piston 1 and a premixed compression injection mode for injecting fuel by timing II to V earlier than the normal injection mode and timing for preventing generation of ignition of fuel till at least injection finishing. The fuel injection is performed by the normal injection mode and the premixed compression injection mode at the time of a high load operation of the engine and at the time of low and middle load operations, respectively. Normal diffusion combustion is realized at the time of the high load operation of the engine and proper fuel injection is executed over the entire operation regions, receiving benefit such as improvement of exhaust gas by premixed compression ignition combustion.