To provide an antitheft valve cap having little complexity, easily dismountable by a proprietor, and hardly dismountable by an imprudent person.

This valve cap is equipped with a hollow body having first and second opposite ends, a shoulder part positioned close to the first end, an interior surface, and an exterior surface arranged on the opposite side of the interior surface. In this case, the first end has an opening part, and the interior surface extends from the opening part, ends close to the second end, and includes plural screw stripes, and the exterior surface extends between the first and second opposite ends.