Abstract: A desk for use in an automobile has a base which is provided with adjustable spring urged retaining hook members for engagement with the bottom edge of the seat back portion of a conventional vehicle seat. The retaining hook members may be adjusted in selected extended positions for use with a wide variety of different configurations of conventional vehicle seats. The adjustable hook members comprise spring biased retaining flanges which, in a first position, may be easily inserted beneath the bottom edge of the automobile seat back portion. The retaining flanges are spring biased to a second position for clamping engagement with the vehicle seat back portion. The desk has an adjustable writing surface which may be pivoted about a vertical mounting post, for enabling occupants seated at either side of a vehicle to easily use the desk. A writing surface of the desk is formed by a slidable cover of a compartmentalized storage tray.