To provide a method for controlling a diesel engine accurately measuring temperature of an exoergic resistance coil and surely controlling the exoergic resistance coil based on the measured value.

A glow plug 1 including a sheathed heater 2 provided in a combustion chamber of the diesel engine and generating heat by current carry, and a glow plug current carry control device 30 controlling current carry to the exoergic resistance coil 5 of the sheathed heater 2 are used. In the glow plug 1, temperature sensing points 10c of thermocouples 10a, 10b capable of outputting temperature of the exoergic resistance coil 5 as output signal are positioned inside of the exoergic resistance coil 5 of the glow plug 1. The glow plug current carry control device 30 executes the feedback control of output signal of the thermocouples 10a, 10b for current carry to the exoergic resistance coil 5.