Abstract: The present invention is a method for detecting or quantifying a target cell or a target protein using an aptamer chip, and particularly, in order to detect a target cell, a method for detecting and/or quantifying a target cell by reacting a cell staining solution (e.g. 4?,6-diamidino-2-phenylindole (DAPI)) with an aptamer chip which the target cell is bound, in order to detect a target protein, a method for detecting and/or quantifying a target protein by reacting Coomassie Brilliant Blue solution with an aptamer chip which the target protein is bound, and a method for reusing the aptamer chip, wherein the aptamer chip comprises a board to which the aptamer specifically combining with the target cell or the target protein is bonded by a disulfide bond.