Engine control unit for learning an electronic throttle control characteristic

Provided is an engine control unit which is capable of determining whether or not a sudden change in ETC characteristic has occurred, timely learning the ETC characteristic, and thus suppressing excessive racing of an engine and enhancing torque realizing accuracy thereof. The engine control unit includes: a characteristic storage means which stores therein a characteristic of an air flow rate with respect to a valve opening degree of an electronic throttle control valve; a characteristic change determination means (405b) which determines at a time of the automatic stop control that the characteristic of the air flow rate has changed in a direction in which the air flow rate increases with respect to the valve opening degree; a characteristic learning means (405c) which corrects the characteristic of the air flow rate on the basis of a result of the determination, to thereby learn the characteristic of the air flow rate.