A coordinate detection system for detecting a coordinate pointed by a pointer with which a pointing operation is performed on a board face includes a first calculation unit that extracts a plurality of areas respectively indicative of a plurality of annular members provided in the pointer from a picked-up image picked by an image pick-up unit arranged at a predetermined position of the board face and calculates center positions of the extracted areas; and a second calculation unit that calculates a position of a tip portion of the pointer on the board face based on the center positions of the areas calculated by the first calculation unit and a position of a principal point of the image pick-up unit.