A control device of a multi-cylinder engine is provided. The device includes first and second auxiliary components. The first auxiliary component generates energy. The device includes an angular speed variation detecting device for detecting an angular speed variation of a crankshaft, and an auxiliary component control device for controlling drive loads of the first and second auxiliary components. When an engine load is low and the angular speed variation exceeds a predetermined threshold, the auxiliary component control device increases a total drive load of the auxiliary components. Here, if the drive load of the first auxiliary component is increasable, the drive load of the first auxiliary component is increased, and when this increase amount is insufficient, the drive load of the second auxiliary component is increased, whereas if the drive load of the first auxiliary component is not increasable, the drive load of the second auxiliary component is increased.