A coordinate detector includes a light output part, a light detection part, a first guide part, and a second guide part. The light output part emits light. The light detection part outputs a detection signal according to the amount of entering light. The light output part and the light detection part are provided in an area around a display part on a side closer to a first surface of the display part than to its second surface facing away from the first surface. The first guide part guides light emitted from the light output part toward a direction along the first surface. The second guide part guides, toward the light detection part, light exiting from the first guide part and passing over the first surface.