Abstract: A device for supporting a stylus in a touch sensor comprises a casing, a stylus having its one end part protruding out of the casing for detecting an object, and a spring for pressing an inner base part of the stylus housed concentrically in the casing outwards from behind wherein a ball is provided at each of three abaxial positions on one of the mutually opposite faces of the stylus inner base part and an end part of the casing while an engaged part with which the ball is allowed to come into contact is configured at each of three corresponding positions on the other of said opposite faces, the three engaged parts are configured respectively into different shapes so the stylus can be kept steady in the casing.