A display device for an internal combustion engine includes a variable compression ratio mechanism structured to vary an engine compression ratio of the internal combustion engine. The display device includes an indicator structured to vary its indication depending on the engine compression ratio. The indicator is configured to maintain the indication constant or within a slight change with respect to a change in the engine compression ratio within each of at least one of first and second dead zones of the engine compression ratio. The first dead zone includes a vicinity of an upper limit of the engine compression ratio including the upper limit. The second dead zone includes a vicinity of a lower limit of the engine compression ratio including the lower limit.