Diesel engine

A diesel engine comprising a fuel injection device (9), an EGR device (19), and a control device (26) for controlling the fuel injection device (9) and EGR device (19) so as to realize a premixed combustion in which a mixture is ignited after the end of fuel injection, the diesel engine further comprising detection unit (31) for detecting the ignition timing of the mixture, wherein when the actual ignition timing detected by the detection unit (31) shifts from the preset optimum ignition timing, the control device (26) corrects the timing of fuel injection conducted by the fuel injection device (9) and matches the actual ignition timing with the optimum ignition timing.