Abstract: The present invention relates to a movable coordinate input apparatus. An object of the present invention is to provide a small size movable coordinate input apparatus which is well adapted to a conventional movable coordinate input apparatus. In the present invention, there is provided a movable coordinate input apparatus which includes a ball, and a cylindrical hollow ball holder wherein the ball includes an insulation portion formed in a net shape on a surface of the same and having a conductive characteristic, and the ball holder includes a ceiling plate on the top portion of the same, a conductive ceiling plate portion contacting with the ball when the ball holder is placed on a floor surface, and an angle sensor having an electrical resistance surface contacting with the ball on an inner surface of the ball holder.