A detection system for detecting an eye gaze of a subject includes an image sensor configured to generate an image by capturing reflected light from a subject side irradiated with light from a light source and a processor. The processor is configured to extract a region from the image, the region having an intensity of the reflected light which is equal to or larger than a specific value, when there are two or more regions, as a extraction result of the region, in which a first region having a characteristic indicating movement over time coexist with a second region having another characteristic indicating no movement over time, determine the first region as a corneal reflection, and detect the eye gaze of the subject based on the corneal reflection.
