A nutrition-enriched grain manufacturing apparatus includes a heating processing portion including a far infrared ray radiator which emits far infrared rays to a flow-down path along which grain flows down, an upper rotary valve device and a lower rotary valve device which adjust a flow rate of the grain, an accumulation portion which accumulates the grain, a lower screw conveyer and a bucket conveyer which transport the grain which has flown down from the heating processing portion to the discharge portion to the accumulation portion, a moisture meter which measures a moisture content of the grain, a grain temperature sensor which measures a grain temperature, a main controller which controls output from a burner and operations of the upper rotary valve device and the lower rotary valve device such that the grain temperature is a predetermined grain temperature.