Abstract: A portable writing board mountable for use on a steering wheel of a vehicle and also entirely stable for writing use when rested upon any flat surface. The board has a platform member which has substantially parallel side edges, a lower edge, and a curved upper edge approximating the curvature of the outer diameter of a vehicle steering wheel. A retaining collar depends from the curved upper edge and is unified thereto. The retaining collar consists essentially of a depending skirt portion and a flange-like portion directed radially inwardly from the skirt portion to thereby form a recess capable of accommodating the rim of a vehicle steering wheel. The most depending portions of the retaining collar form a bottom surface which extends continuously along the entire curvature of the retaining collar, and lies in an imaginary plane intersecting the platform at an axis line perpendicular to the side edges of the platform and located at the lowermost bottom edge of the platform.