To easily stick a lap by oneself to a dried-inclined glossy smooth surface such as front glass of an automobile.

A lap box holder is provided with a water sprinkling tool for sprinkling water on the glossy smooth surface for sticking the lap and a holder for temporarily holding the lap box holder on the glossy smooth surface for sticking the lap, and holds a lap box for food. The lap box holder for installing the lap box for the food is temporarily held on the dried-inclined glossy smooth surface such as the front glass of the automobile by the holder, and after jetting water to the glossy smooth surface by the water sprinkling tool, the lap is extracted and stuck to the glossy smooth surface jetted with the water, and afterwards, the lap is extracted by the required length, and after temporarily holding the lap box holder again on the glossy smooth surface, the water is jetted again to the glossy smooth surface by the water sprinkling tool, and is stuck to the glossy smooth surface jetted with the water by finally cutting the lap. The lap can be easily stuck by oneself to the dried-inclined glossy smooth surface such as the front glass of the automobile by the procedure.