Provided is a control apparatus for an internal combustion engine which can successfully determine whether or not a failure concerning a stopping operation of an exhaust valve has occurred, without the need of providing a dedicated sensor for the failure determination. The display device includes a light source, a light guide part to receive a light emitted from the light source, a light conversion member between the light source and the light guide part, and a spacer between the light source and the light conversion member. The elastic part forms an overhang arranged axially on a radially running portion of the carrier ring, and the overhang radially covers a radial end piece of the cover ring at least partially.