| 摘要 |
A cursor key case is idly held in a cylindrical holder of a controller case, so as to movable in a predetermined number of plural directions extending from a center point while keeping point symmetry. The cursor key case is provided on a polygonal flange having the predetermined number of plural side end faces, each associated with each of the movable directions. An outer diameter of the cylindrical holder is larger than a dimension between opposing side end faces of the polygonal flange. A top face of the polygonal flange is abutted against a lower end face of the cylindrical holder when the cursor key case is placed in a neutral position. One side end face of the polygonal flange is moved down by operating the cursor key case in one movable direction so that an opposite side end face of the polygonal flange is brought into at least two-point contact with the lower end face of the cylindrical holder.
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